diff --git a/.rubocop_styleguide.yml b/.rubocop_styleguide.yml
index 31e65d089b..500b642c70 100644
--- a/.rubocop_styleguide.yml
+++ b/.rubocop_styleguide.yml
@@ -27,11 +27,16 @@ Metrics/BlockLength:
     "class_eval",
     "collection",
     "context",
+    "delete",
     "describe",
     "feature",
+    "get",
     "it",
     "member",
     "namespace",
+    "path",
+    "post",
+    "put",
     "resource",
     "resources",
     "scenario",
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 2815da9648..d796055b5f 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -466,6 +466,7 @@ Metrics/BlockLength:
     - 'spec/lib/open_food_network/group_buy_report_spec.rb'
     - 'spec/requests/api/orders_spec.rb'
     - 'spec/spec_helper.rb'
+    - 'spec/swagger_helper.rb'
     - 'spec/support/cancan_helper.rb'
     - 'spec/support/matchers/select2_matchers.rb'
     - 'spec/support/matchers/table_matchers.rb'
@@ -582,6 +583,7 @@ Metrics/MethodLength:
     - 'app/controllers/spree/orders_controller.rb'
     - 'app/helpers/checkout_helper.rb'
     - 'app/helpers/spree/admin/navigation_helper.rb'
+    - "app/json_schemas/json_api_schema.rb"
     - 'app/models/spree/ability.rb'
     - 'app/models/spree/gateway/pay_pal_express.rb'
     - 'app/models/spree/order/checkout.rb'
diff --git a/Gemfile b/Gemfile
index 72210c3408..c7fe245943 100644
--- a/Gemfile
+++ b/Gemfile
@@ -57,6 +57,7 @@ gem 'devise-token_authenticatable'
 gem 'jwt', '~> 2.3'
 gem 'oauth2', '~> 1.4.7' # Used for Stripe Connect
 
+gem 'jsonapi-serializer'
 gem 'pagy', '~> 5.1'
 
 gem 'rswag-api'
diff --git a/Gemfile.lock b/Gemfile.lock
index c5950fa8b2..a3a6b9e440 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -346,6 +346,8 @@ GEM
     json_spec (1.1.5)
       multi_json (~> 1.0)
       rspec (>= 2.0, < 4.0)
+    jsonapi-serializer (2.2.0)
+      activesupport (>= 4.2)
     jwt (2.3.0)
     knapsack (4.0.0)
       rake
@@ -739,6 +741,7 @@ DEPENDENCIES
   jquery-ui-rails (~> 4.2)
   json
   json_spec (~> 1.1.4)
+  jsonapi-serializer
   jwt (~> 2.3)
   knapsack
   letter_opener (>= 1.4.1)
diff --git a/app/controllers/api/v1/base_controller.rb b/app/controllers/api/v1/base_controller.rb
new file mode 100644
index 0000000000..aca1c09e55
--- /dev/null
+++ b/app/controllers/api/v1/base_controller.rb
@@ -0,0 +1,97 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class BaseController < ActionController::API
+      include CanCan::ControllerAdditions
+      include RequestTimeouts
+      include Pagy::Backend
+      include JsonApiPagination
+
+      check_authorization
+
+      attr_accessor :current_api_user
+
+      before_action :authenticate_user
+
+      rescue_from StandardError, with: :error_during_processing
+      rescue_from CanCan::AccessDenied, with: :unauthorized
+      rescue_from ActiveRecord::RecordNotFound, with: :not_found
+      rescue_from Pagy::VariableError, with: :invalid_pagination
+
+      private
+
+      def authenticate_user
+        return if (@current_api_user = request.env['warden'].user)
+
+        if api_key.blank?
+          # An anonymous user
+          @current_api_user = Spree::User.new
+          return
+        end
+
+        return if (@current_api_user = Spree::User.find_by(spree_api_key: api_key.to_s))
+
+        invalid_api_key
+      end
+
+      def current_ability
+        Spree::Ability.new(current_api_user)
+      end
+
+      def api_key
+        request.headers["X-Api-Token"] || params[:token]
+      end
+
+      def error_during_processing(exception)
+        Bugsnag.notify(exception)
+
+        if Rails.env.development? || Rails.env.test?
+          render status: :unprocessable_entity,
+                 json: json_api_error(exception.message, meta: exception.backtrace)
+        else
+          render status: :unprocessable_entity,
+                 json: json_api_error(I18n.t(:unknown_error, scope: "api"))
+        end
+      end
+
+      def invalid_pagination(exception)
+        render status: :unprocessable_entity,
+               json: json_api_error(exception.message)
+      end
+
+      def invalid_resource!(resource = nil)
+        render status: :unprocessable_entity,
+               json: json_api_invalid(
+                 I18n.t(:invalid_resource, scope: "api"),
+                 resource&.errors
+               )
+      end
+
+      def invalid_api_key
+        render status: :unauthorized,
+               json: json_api_error(I18n.t(:invalid_api_key, key: api_key, scope: "api"))
+      end
+
+      def unauthorized
+        render status: :unauthorized,
+               json: json_api_error(I18n.t(:unauthorized, scope: "api"))
+      end
+
+      def not_found
+        render status: :not_found,
+               json: json_api_error(I18n.t(:resource_not_found, scope: "api"))
+      end
+
+      def json_api_error(message, **options)
+        { errors: [{ detail: message }] }.merge(options)
+      end
+
+      def json_api_invalid(message, errors)
+        error_response = { errors: [{ detail: message }] }
+        error_response.merge!(meta: { validation_errors: errors.to_a }) if errors.any?
+        error_response
+      end
+    end
+  end
+end
diff --git a/app/controllers/api/v1/customers_controller.rb b/app/controllers/api/v1/customers_controller.rb
new file mode 100644
index 0000000000..6c403ce2d4
--- /dev/null
+++ b/app/controllers/api/v1/customers_controller.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+
+require 'open_food_network/permissions'
+
+module Api
+  module V1
+    class CustomersController < Api::V1::BaseController
+      skip_authorization_check only: :index
+
+      before_action :set_customer, only: [:show, :update, :destroy]
+      before_action :authorize_action, only: [:show, :update, :destroy]
+
+      def index
+        @pagy, customers = pagy(search_customers, pagy_options)
+
+        render json: Api::V1::CustomerSerializer.new(customers, pagination_options)
+      end
+
+      def show
+        render json: Api::V1::CustomerSerializer.new(@customer)
+      end
+
+      def create
+        authorize! :update, Enterprise.find(customer_params[:enterprise_id])
+        @customer = Customer.new(customer_params)
+
+        if @customer.save
+          render json: Api::V1::CustomerSerializer.new(@customer), status: :created
+        else
+          invalid_resource! @customer
+        end
+      end
+
+      def update
+        if @customer.update(customer_params)
+          render json: Api::V1::CustomerSerializer.new(@customer)
+        else
+          invalid_resource! @customer
+        end
+      end
+
+      def destroy
+        if @customer.destroy
+          render json: Api::V1::CustomerSerializer.new(@customer)
+        else
+          invalid_resource! @customer
+        end
+      end
+
+      private
+
+      def set_customer
+        @customer = Customer.find(params[:id])
+      end
+
+      def authorize_action
+        authorize! action_name.to_sym, @customer
+      end
+
+      def search_customers
+        customers = visible_customers
+        customers = customers.where(enterprise_id: params[:enterprise_id]) if params[:enterprise_id]
+        customers.ransack(params[:q]).result
+      end
+
+      def visible_customers
+        current_api_user.customers.or(
+          Customer.where(enterprise_id: editable_enterprises)
+        )
+      end
+
+      def customer_params
+        params.require(:customer).permit(:email, :enterprise_id)
+      end
+
+      def editable_enterprises
+        OpenFoodNetwork::Permissions.new(current_api_user).editable_enterprises.select(:id)
+      end
+    end
+  end
+end
diff --git a/app/controllers/concerns/json_api_pagination.rb b/app/controllers/concerns/json_api_pagination.rb
new file mode 100644
index 0000000000..b014e3119b
--- /dev/null
+++ b/app/controllers/concerns/json_api_pagination.rb
@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+module JsonApiPagination
+  extend ActiveSupport::Concern
+
+  DEFAULT_PER_PAGE = 50
+  MAX_PER_PAGE = 200
+
+  def pagination_options
+    {
+      is_collection: true,
+      meta: meta_options,
+      links: links_options,
+    }
+  end
+
+  def pagy_options
+    { items: final_per_page_value }
+  end
+
+  private
+
+  def meta_options
+    {
+      pagination: {
+        results: @pagy.count,
+        pages: total_pages,
+        page: current_page,
+        per_page: final_per_page_value
+      }
+    }
+  end
+
+  def links_options
+    {
+      self: pagination_url(current_page),
+      first: pagination_url(1),
+      prev: pagination_url(previous_page),
+      next: pagination_url(next_page),
+      last: pagination_url(total_pages)
+    }
+  end
+
+  def pagination_url(page_number)
+    return if page_number.nil?
+
+    url_for(only_path: false, params: request.query_parameters.merge(page: page_number))
+  end
+
+  # User-specified value, or DEFAULT_PER_PAGE, capped at MAX_PER_PAGE
+  def final_per_page_value
+    (params[:per_page] || DEFAULT_PER_PAGE).to_i.clamp(1, MAX_PER_PAGE)
+  end
+
+  def current_page
+    (params[:page] || 1).to_i
+  end
+
+  def total_pages
+    @pagy.pages
+  end
+
+  def previous_page
+    return nil if current_page < 2
+
+    current_page - 1
+  end
+
+  def next_page
+    return nil if current_page >= total_pages
+
+    current_page + 1
+  end
+end
diff --git a/app/json_schemas/customer_schema.rb b/app/json_schemas/customer_schema.rb
new file mode 100644
index 0000000000..4652ae3bbf
--- /dev/null
+++ b/app/json_schemas/customer_schema.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class CustomerSchema < JsonApiSchema
+  def self.object_name
+    "customer"
+  end
+
+  def self.attributes
+    {
+      id: { type: :integer, example: 1 },
+      enterprise_id: { type: :integer, example: 2 },
+      first_name: { type: :string, nullable: true, example: "Alice" },
+      last_name: { type: :string, nullable: true, example: "Springs" },
+      code: { type: :string, nullable: true, example: "BUYER1" },
+      email: { type: :string, example: "alice@example.com" }
+    }
+  end
+
+  def self.required_attributes
+    [:enterprise_id, :email]
+  end
+
+  def self.relationships
+    [:enterprise]
+  end
+end
diff --git a/app/json_schemas/errors_schema.rb b/app/json_schemas/errors_schema.rb
new file mode 100644
index 0000000000..590dda849d
--- /dev/null
+++ b/app/json_schemas/errors_schema.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class ErrorsSchema
+  def self.schema
+    {
+      type: :object,
+      properties: {
+        errors: {
+          type: :array,
+          items: {
+            type: :object,
+            properties: {
+              title: { type: :string },
+              detail: { type: :string },
+              source: { type: :object }
+            },
+            required: [:detail]
+          }
+        }
+      },
+      required: [:errors]
+    }
+  end
+end
diff --git a/app/json_schemas/json_api_schema.rb b/app/json_schemas/json_api_schema.rb
new file mode 100644
index 0000000000..069de6633d
--- /dev/null
+++ b/app/json_schemas/json_api_schema.rb
@@ -0,0 +1,114 @@
+# frozen_string_literal: true
+
+class JsonApiSchema
+  class << self
+    def attributes
+      {}
+    end
+
+    def required_attributes
+      []
+    end
+
+    def relationships
+      []
+    end
+
+    def all_attributes
+      attributes.keys
+    end
+
+    def schema(options = {})
+      {
+        type: :object,
+        properties: {
+          data: {
+            type: :object,
+            properties: data_properties(**options)
+          },
+          meta: { type: :object },
+          links: { type: :object }
+        },
+        required: [:data]
+      }
+    end
+
+    def collection(options)
+      {
+        type: :object,
+        properties: {
+          data: {
+            type: :array,
+            items: {
+              type: :object,
+              properties: data_properties(**options)
+            }
+          },
+          meta: {
+            type: :object,
+            properties: {
+              pagination: {
+                type: :object,
+                properties: {
+                  results: { type: :integer, example: 250 },
+                  pages: { type: :integer, example: 5 },
+                  page: { type: :integer, example: 2 },
+                  per_page: { type: :integer, example: 50 },
+                }
+              }
+            },
+            required: [:pagination]
+          },
+          links: {
+            type: :object,
+            properties: {
+              self: { type: :string },
+              first: { type: :string },
+              prev: { type: :string, nullable: true },
+              next: { type: :string, nullable: true },
+              last: { type: :string }
+            }
+          }
+        },
+        required: [:data, :meta, :links]
+      }
+    end
+
+    private
+
+    def data_properties(require_all: false)
+      required = require_all ? all_attributes : required_attributes
+
+      {
+        id: { type: :string, example: "1" },
+        type: { type: :string, example: object_name },
+        attributes: {
+          type: :object,
+          properties: attributes,
+          required: required
+        },
+        relationships: {
+          type: :object,
+          properties: relationships.to_h do |name|
+            [
+              name,
+              relationship_schema(name)
+            ]
+          end
+        }
+      }
+    end
+
+    def relationship_schema(name)
+      if is_singular?(name)
+        RelationshipSchema.schema(name)
+      else
+        RelationshipSchema.collection(name)
+      end
+    end
+
+    def is_singular?(name)
+      name.to_s.singularize == name.to_s
+    end
+  end
+end
diff --git a/app/json_schemas/relationship_schema.rb b/app/json_schemas/relationship_schema.rb
new file mode 100644
index 0000000000..a223fd390f
--- /dev/null
+++ b/app/json_schemas/relationship_schema.rb
@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+class RelationshipSchema
+  def self.schema(resource_name = nil)
+    {
+      type: :object,
+      properties: {
+        data: {
+          type: :object,
+          properties: {
+            id: { type: :string },
+            type: { type: :string, example: resource_name }
+          }
+        },
+        links: {
+          type: :object,
+          properties: {
+            related: { type: :string }
+          }
+        }
+      }
+    }
+  end
+
+  def self.collection(resource_name = nil)
+    {
+      type: :object,
+      properties: {
+        data: {
+          type: :array,
+          items: {
+            type: :object,
+            properties: {
+              id: { type: :string },
+              type: { type: :string, example: resource_name }
+            }
+          }
+        },
+        links: {
+          type: :object,
+          properties: {
+            related: { type: :string }
+          }
+        }
+      }
+    }
+  end
+end
diff --git a/app/serializers/api/v1/base_serializer.rb b/app/serializers/api/v1/base_serializer.rb
new file mode 100644
index 0000000000..4689406779
--- /dev/null
+++ b/app/serializers/api/v1/base_serializer.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class BaseSerializer
+      include JSONAPI::Serializer
+
+      def self.url_helpers
+        Rails.application.routes.url_helpers
+      end
+    end
+  end
+end
diff --git a/app/serializers/api/v1/customer_serializer.rb b/app/serializers/api/v1/customer_serializer.rb
new file mode 100644
index 0000000000..6f71b39159
--- /dev/null
+++ b/app/serializers/api/v1/customer_serializer.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class CustomerSerializer < BaseSerializer
+      attributes :id, :enterprise_id, :first_name, :last_name, :code, :email
+
+      belongs_to :enterprise, links: {
+        related: ->(object) {
+          url_helpers.api_v1_enterprise_url(id: object.enterprise_id)
+        }
+      }
+    end
+  end
+end
diff --git a/app/serializers/api/v1/enterprise_serializer.rb b/app/serializers/api/v1/enterprise_serializer.rb
new file mode 100644
index 0000000000..abbb9cdd3c
--- /dev/null
+++ b/app/serializers/api/v1/enterprise_serializer.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class EnterpriseSerializer < BaseSerializer
+      attributes :id, :name
+
+      has_many :customers, links: {
+        related: ->(object) {
+          url_helpers.api_v1_enterprise_customers_url(enterprise_id: object.id)
+        }
+      }
+    end
+  end
+end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e031fa6c61..7bee8133c7 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -165,7 +165,6 @@ en:
               no_default_card: "^No default card available for this customer"
             shipping_method:
               not_available_to_shop: "is not available to %{shop}"
-
   card_details: "Card details"
   card_type: "Card type"
   cardholder_name: "Cardholder name"
@@ -1410,6 +1409,11 @@ en:
 # API
 #
   api:
+    unknown_error: "Something went wrong. Our team has been notified."
+    invalid_api_key: "Invalid API key (%{key}) specified."
+    unauthorized: "You are not authorized to perform that action."
+    invalid_resource: "Invalid resource. Please fix errors and try again."
+    resource_not_found: "The resource you were looking for could not be found."
     enterprise_logo:
       destroy_attachment_does_not_exist: "Logo does not exist"
     enterprise_promo_image:
diff --git a/config/routes/api.rb b/config/routes/api.rb
index 062958c495..9fa70e1d13 100644
--- a/config/routes/api.rb
+++ b/config/routes/api.rb
@@ -87,6 +87,16 @@ Openfoodnetwork::Application.routes.draw do
           constraints: lambda { |_| Flipper.enabled?(:api_reports) }
     end
 
+    unless Rails.env.production?
+      namespace :v1 do
+        resources :customers
+
+        resources :enterprises do
+          resources :customers, only: :index
+        end
+      end
+    end
+
     match '*path', to: redirect(path: "/api/v0/%{path}"), via: :all, constraints: { path: /(?!v[0-9]).+/ }
   end
 end
diff --git a/spec/requests/api/v1/customers_spec.rb b/spec/requests/api/v1/customers_spec.rb
new file mode 100644
index 0000000000..7c8519a4b0
--- /dev/null
+++ b/spec/requests/api/v1/customers_spec.rb
@@ -0,0 +1,245 @@
+# frozen_string_literal: true
+
+require "swagger_helper"
+
+describe "Customers", type: :request do
+  let!(:enterprise1) { create(:enterprise) }
+  let!(:enterprise2) { create(:enterprise) }
+  let!(:customer1) { create(:customer, enterprise: enterprise1) }
+  let!(:customer2) { create(:customer, enterprise: enterprise1) }
+  let!(:customer3) { create(:customer, enterprise: enterprise2) }
+
+  before { login_as enterprise1.owner }
+
+  path "/api/v1/customers" do
+    get "List customers" do
+      tags "Customers"
+      parameter name: :enterprise_id, in: :query, type: :string
+      produces "application/json"
+
+      response "200", "Customers list" do
+        param(:enterprise_id) { enterprise1.id }
+        schema "$ref": "#/components/schemas/resources/customers_collection"
+
+        run_test!
+      end
+    end
+
+    describe "returning results based on permissions" do
+      context "as guest user" do
+        before { login_as nil }
+
+        it "returns no customers" do
+          get "/api/v1/customers"
+          expect(json_response_ids).to eq []
+        end
+
+        it "returns not even customers without user id" do
+          customer3.update!(user_id: nil)
+
+          get "/api/v1/customers"
+          expect(json_response_ids).to eq []
+        end
+      end
+
+      context "as an enterprise owner" do
+        before { login_as enterprise1.owner }
+
+        it "returns customers of enterprises the user manages" do
+          get "/api/v1/customers"
+          expect(json_response_ids).to eq [customer1.id.to_s, customer2.id.to_s]
+        end
+      end
+
+      context "as another enterprise owner" do
+        before { login_as enterprise2.owner }
+
+        it "returns customers of enterprises the user manages" do
+          get "/api/v1/customers"
+          expect(json_response_ids).to eq [customer3.id.to_s]
+        end
+      end
+
+      context "with ransack params searching for specific customers" do
+        before { login_as enterprise2.owner }
+
+        it "does not show results the user doesn't have permissions to view" do
+          get "/api/v1/customers", params: { q: { id_eq: customer2.id } }
+
+          expect(json_response_ids).to eq []
+        end
+      end
+    end
+
+    describe "pagination" do
+      it "renders the first page" do
+        get "/api/v1/customers", params: { page: "1" }
+        expect(json_response_ids).to eq [customer1.id.to_s, customer2.id.to_s]
+      end
+
+      it "renders the second page" do
+        get "/api/v1/customers", params: { page: "2", per_page: "1" }
+        expect(json_response_ids).to eq [customer2.id.to_s]
+      end
+
+      it "renders beyond the available pages" do
+        get "/api/v1/customers", params: { page: "2" }
+        expect(json_response_ids).to eq []
+      end
+
+      it "informs about invalid pages" do
+        get "/api/v1/customers", params: { page: "0" }
+        expect(json_response_ids).to eq nil
+        expect(json_error_detail).to eq 'expected :page >= 1; got "0"'
+      end
+    end
+
+    post "Create customer" do
+      tags "Customers"
+      consumes "application/json"
+      produces "application/json"
+
+      parameter name: :customer, in: :body, schema: {
+        type: :object,
+        properties: CustomerSchema.attributes.except(:id),
+        required: CustomerSchema.required_attributes
+      }
+
+      response "201", "Customer created" do
+        param(:customer) do
+          {
+            email: "test@example.com",
+            enterprise_id: enterprise1.id.to_s
+          }
+        end
+        schema "$ref": "#/components/schemas/resources/customer"
+
+        run_test!
+      end
+
+      response "422", "Unprocessable entity" do
+        param(:customer) { {} }
+        schema "$ref": "#/components/schemas/error_response"
+
+        run_test!
+      end
+    end
+  end
+
+  path "/api/v1/customers/{id}" do
+    get "Show customer" do
+      tags "Customers"
+      parameter name: :id, in: :path, type: :string
+      produces "application/json"
+
+      response "200", "Customer" do
+        param(:id) { customer1.id }
+        schema "$ref": "#/components/schemas/resources/customer"
+
+        run_test!
+      end
+
+      response "404", "Not found" do
+        param(:id) { 0 }
+        schema "$ref": "#/components/schemas/error_response"
+
+        run_test! do
+          expect(json_error_detail).to eq "The resource you were looking for could not be found."
+        end
+      end
+
+      context "without authentication" do
+        before { logout }
+
+        response "401", "Unauthorized" do
+          param(:id) { customer1.id }
+          schema "$ref": "#/components/schemas/error_response"
+
+          run_test! do
+            expect(json_error_detail).to eq "You are not authorized to perform that action."
+          end
+        end
+      end
+
+      describe "related records" do
+        it "serializes the enterprise relationship" do
+          expected_enterprise_data = {
+            "data" => {
+              "id" => customer1.enterprise_id.to_s,
+              "type" => "enterprise"
+            },
+            "links" => {
+              "related" => "http://test.host/api/v1/enterprises/#{customer1.enterprise_id}"
+            }
+          }
+
+          get "/api/v1/customers/#{customer1.id}"
+          expect(json_response[:data][:relationships][:enterprise]).to eq(expected_enterprise_data)
+        end
+      end
+    end
+
+    put "Update customer" do
+      tags "Customers"
+      parameter name: :id, in: :path, type: :string
+      consumes "application/json"
+      produces "application/json"
+
+      parameter name: :customer, in: :body, schema: {
+        type: :object,
+        properties: CustomerSchema.attributes,
+        required: CustomerSchema.required_attributes
+      }
+
+      response "200", "Customer updated" do
+        param(:id) { customer1.id }
+        param(:customer) do
+          {
+            id: customer1.id.to_s,
+            email: "test@example.com",
+            enterprise_id: enterprise1.id.to_s
+          }
+        end
+        schema "$ref": "#/components/schemas/resources/customer"
+
+        run_test!
+      end
+
+      response "422", "Unprocessable entity" do
+        param(:id) { customer1.id }
+        param(:customer) { {} }
+        schema "$ref": "#/components/schemas/error_response"
+
+        run_test!
+      end
+    end
+
+    delete "Delete customer" do
+      tags "Customers"
+      parameter name: :id, in: :path, type: :string
+      produces "application/json"
+
+      response "200", "Customer deleted" do
+        param(:id) { customer1.id }
+        schema "$ref": "#/components/schemas/resources/customer"
+
+        run_test!
+      end
+    end
+  end
+
+  path "/api/v1/enterprises/{enterprise_id}/customers" do
+    get "List customers of an enterprise" do
+      tags "Customers", "Enterprises"
+      parameter name: :enterprise_id, in: :path, type: :string, required: true
+      produces "application/json"
+
+      response "200", "Customers list" do
+        param(:enterprise_id) { enterprise1.id }
+        schema "$ref": "#/components/schemas/resources/customers_collection"
+
+        run_test!
+      end
+    end
+  end
+end
diff --git a/spec/support/api_helper.rb b/spec/support/api_helper.rb
index 9ac5c7a1cb..37d1d6a4d1 100644
--- a/spec/support/api_helper.rb
+++ b/spec/support/api_helper.rb
@@ -14,6 +14,14 @@ module OpenFoodNetwork
       end
     end
 
+    def json_response_ids
+      json_response[:data]&.map{ |item| item["id"] }
+    end
+
+    def json_error_detail
+      json_response[:errors][0][:detail]
+    end
+
     def assert_unauthorized!
       expect(json_response).to eq("error" => "You are not authorized to perform that action.")
       expect(response.status).to eq 401
diff --git a/spec/swagger_helper.rb b/spec/swagger_helper.rb
index d47d6a49ae..46e7a7760d 100644
--- a/spec/swagger_helper.rb
+++ b/spec/swagger_helper.rb
@@ -3,6 +3,9 @@
 require 'spec_helper'
 
 RSpec.configure do |config|
+  config.include Devise::Test::IntegrationHelpers, type: :request
+  config.include OpenFoodNetwork::ApiHelper, type: :request
+
   # Specify a root folder where Swagger JSON files are generated
   # NOTE: If you're using the rswag-api to serve API descriptions, you'll need
   # to ensure that it's configured to serve Swagger from the same folder
@@ -21,6 +24,35 @@ RSpec.configure do |config|
         title: 'API V1',
         version: 'v1'
       },
+      components: {
+        schemas: {
+          error_response: ErrorsSchema.schema,
+          resources: {
+            customer: CustomerSchema.schema(require_all: true),
+            customers_collection: CustomerSchema.collection(require_all: true)
+          }
+        },
+        securitySchemas: {
+          api_key_header: {
+            type: :apiKey,
+            name: 'X-Api-Token',
+            in: :header,
+            description: "Authenticates via API key passed in specified header"
+          },
+          api_key_param: {
+            type: :apiKey,
+            name: 'token',
+            in: :query,
+            description: "Authenticates via API key passed in specified query param"
+          },
+          session: {
+            type: :http,
+            name: '_ofn_session',
+            in: :cookie,
+            description: "Authenticates using the current user's session if logged in"
+          },
+        }
+      },
       paths: {},
       servers: [
         { url: "/" }
@@ -41,3 +73,10 @@ RSpec.configure do |config|
   # Defaults to json. Accepts ':json' and ':yaml'.
   config.swagger_format = :yaml
 end
+
+module RswagExtension
+  def param(args, &block)
+    public_send(:let, args) { instance_eval(&block) }
+  end
+end
+Rswag::Specs::ExampleGroupHelpers.prepend RswagExtension
diff --git a/swagger/v1/swagger.yaml b/swagger/v1/swagger.yaml
index d387a8fd33..9b2642959d 100644
--- a/swagger/v1/swagger.yaml
+++ b/swagger/v1/swagger.yaml
@@ -3,6 +3,395 @@ openapi: 3.0.1
 info:
   title: API V1
   version: v1
-paths: {}
+components:
+  schemas:
+    error_response:
+      type: object
+      properties:
+        errors:
+          type: array
+          items:
+            type: object
+            properties:
+              title:
+                type: string
+              detail:
+                type: string
+              source:
+                type: object
+            required:
+            - detail
+      required:
+      - errors
+    resources:
+      customer:
+        type: object
+        properties:
+          data:
+            type: object
+            properties:
+              id:
+                type: string
+                example: '1'
+              type:
+                type: string
+                example: customer
+              attributes:
+                type: object
+                properties:
+                  id:
+                    type: integer
+                    example: 1
+                  enterprise_id:
+                    type: integer
+                    example: 2
+                  first_name:
+                    type: string
+                    nullable: true
+                    example: Alice
+                  last_name:
+                    type: string
+                    nullable: true
+                    example: Springs
+                  code:
+                    type: string
+                    nullable: true
+                    example: BUYER1
+                  email:
+                    type: string
+                    example: alice@example.com
+                required:
+                - id
+                - enterprise_id
+                - first_name
+                - last_name
+                - code
+                - email
+              relationships:
+                type: object
+                properties:
+                  enterprise:
+                    type: object
+                    properties:
+                      data:
+                        type: object
+                        properties:
+                          id:
+                            type: string
+                          type:
+                            type: string
+                            example: enterprise
+                      links:
+                        type: object
+                        properties:
+                          related:
+                            type: string
+          meta:
+            type: object
+          links:
+            type: object
+        required:
+        - data
+      customers_collection:
+        type: object
+        properties:
+          data:
+            type: array
+            items:
+              type: object
+              properties:
+                id:
+                  type: string
+                  example: '1'
+                type:
+                  type: string
+                  example: customer
+                attributes:
+                  type: object
+                  properties:
+                    id:
+                      type: integer
+                      example: 1
+                    enterprise_id:
+                      type: integer
+                      example: 2
+                    first_name:
+                      type: string
+                      nullable: true
+                      example: Alice
+                    last_name:
+                      type: string
+                      nullable: true
+                      example: Springs
+                    code:
+                      type: string
+                      nullable: true
+                      example: BUYER1
+                    email:
+                      type: string
+                      example: alice@example.com
+                  required:
+                  - id
+                  - enterprise_id
+                  - first_name
+                  - last_name
+                  - code
+                  - email
+                relationships:
+                  type: object
+                  properties:
+                    enterprise:
+                      type: object
+                      properties:
+                        data:
+                          type: object
+                          properties:
+                            id:
+                              type: string
+                            type:
+                              type: string
+                              example: enterprise
+                        links:
+                          type: object
+                          properties:
+                            related:
+                              type: string
+          meta:
+            type: object
+            properties:
+              pagination:
+                type: object
+                properties:
+                  results:
+                    type: integer
+                    example: 250
+                  pages:
+                    type: integer
+                    example: 5
+                  page:
+                    type: integer
+                    example: 2
+                  per_page:
+                    type: integer
+                    example: 50
+            required:
+            - pagination
+          links:
+            type: object
+            properties:
+              self:
+                type: string
+              first:
+                type: string
+              prev:
+                type: string
+                nullable: true
+              next:
+                type: string
+                nullable: true
+              last:
+                type: string
+        required:
+        - data
+        - meta
+        - links
+  securitySchemas:
+    api_key_header:
+      type: apiKey
+      name: X-Api-Token
+      in: header
+      description: Authenticates via API key passed in specified header
+    api_key_param:
+      type: apiKey
+      name: token
+      in: query
+      description: Authenticates via API key passed in specified query param
+    session:
+      type: http
+      name: _ofn_session
+      in: cookie
+      description: Authenticates using the current user's session if logged in
+paths:
+  "/api/v1/customers":
+    get:
+      summary: List customers
+      tags:
+      - Customers
+      parameters:
+      - name: enterprise_id
+        in: query
+        schema:
+          type: string
+      responses:
+        '200':
+          description: Customers list
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customers_collection"
+    post:
+      summary: Create customer
+      tags:
+      - Customers
+      parameters: []
+      responses:
+        '201':
+          description: Customer created
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customer"
+        '422':
+          description: Unprocessable entity
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error_response"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                enterprise_id:
+                  type: integer
+                  example: 2
+                first_name:
+                  type: string
+                  nullable: true
+                  example: Alice
+                last_name:
+                  type: string
+                  nullable: true
+                  example: Springs
+                code:
+                  type: string
+                  nullable: true
+                  example: BUYER1
+                email:
+                  type: string
+                  example: alice@example.com
+              required:
+              - enterprise_id
+              - email
+  "/api/v1/customers/{id}":
+    get:
+      summary: Show customer
+      tags:
+      - Customers
+      parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+      responses:
+        '200':
+          description: Customer
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customer"
+        '404':
+          description: Not found
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error_response"
+        '401':
+          description: Unauthorized
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error_response"
+    put:
+      summary: Update customer
+      tags:
+      - Customers
+      parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+      responses:
+        '200':
+          description: Customer updated
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customer"
+        '422':
+          description: Unprocessable entity
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/error_response"
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                id:
+                  type: integer
+                  example: 1
+                enterprise_id:
+                  type: integer
+                  example: 2
+                first_name:
+                  type: string
+                  nullable: true
+                  example: Alice
+                last_name:
+                  type: string
+                  nullable: true
+                  example: Springs
+                code:
+                  type: string
+                  nullable: true
+                  example: BUYER1
+                email:
+                  type: string
+                  example: alice@example.com
+              required:
+              - enterprise_id
+              - email
+    delete:
+      summary: Delete customer
+      tags:
+      - Customers
+      parameters:
+      - name: id
+        in: path
+        required: true
+        schema:
+          type: string
+      responses:
+        '200':
+          description: Customer deleted
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customer"
+  "/api/v1/enterprises/{enterprise_id}/customers":
+    get:
+      summary: List customers of an enterprise
+      tags:
+      - Customers
+      - Enterprises
+      parameters:
+      - name: enterprise_id
+        in: path
+        required: true
+        schema:
+          type: string
+      responses:
+        '200':
+          description: Customers list
+          content:
+            application/json:
+              schema:
+                "$ref": "#/components/schemas/resources/customers_collection"
 servers:
 - url: "/"