Add new payment method StripeSCA that will use the Stripe Payment Intents API instead of the Stripe Charges API that the current StripeConnect gatreway uses

app/assets/javascripts/darkswarm/services/checkout.js.coffee

@@ -7,6 +7,8 @@ Darkswarm.factory 'Checkout', ($injector, CurrentOrder, ShippingMethods, StripeE
     purchase: ->
       if @paymentMethod()?.method_type == 'stripe' && !@secrets.selected_card
         StripeElements.requestToken(@secrets, @submit)
+      else if @paymentMethod()?.method_type == 'stripe_sca' && !@secrets.selected_card
+        StripeElements.createPaymentMethod(@secrets, @submit)
       else
         @submit()
 
@@ -59,7 +61,7 @@ Darkswarm.factory 'Checkout', ($injector, CurrentOrder, ShippingMethods, StripeE
             last_name: @order.bill_address.lastname
         }
 
-      if @paymentMethod()?.method_type == 'stripe'
+      if @paymentMethod()?.method_type == 'stripe' || @paymentMethod()?.method_type == 'stripe_sca'
         if @secrets.selected_card
           angular.extend munged_order, {
             existing_card_id: @secrets.selected_card

app/assets/javascripts/darkswarm/services/stripe_elements.js.coffee

@@ -1,12 +1,10 @@
 Darkswarm.factory 'StripeElements', ($rootScope, Loading, RailsFlashLoader) ->
   new class StripeElements
-    # TODO: add locale here for translations of error messages etc. from Stripe
-
     # These are both set from the StripeElements directive
     stripe: null
     card: null
 
-    # New Stripe Elements method
+    # Create Token to be used with the Stripe Charges API
     requestToken: (secrets, submit, loading_message = t("processing_payment")) ->
       return unless @stripe? && @card?
 
@@ -23,6 +21,24 @@ Darkswarm.factory 'StripeElements', ($rootScope, Loading, RailsFlashLoader) ->
           secrets.card = response.token.card
           submit()
 
+    # Create Payment Method to be used with the Stripe Payment Intents API
+    createPaymentMethod: (secrets, submit, loading_message = t("processing_payment")) ->
+      return unless @stripe? && @card?
+
+      Loading.message = loading_message
+      cardData = @makeCardData(secrets)
+
+      @stripe.createPaymentMethod({ type: 'card', card: @card }
+        @card, cardData).then (response) =>
+        if(response.error)
+          Loading.clear()
+          RailsFlashLoader.loadFlash({error: t("error") + ": #{response.error.message}"})
+        else
+          secrets.token = response.paymentMethod.id
+          secrets.cc_type = response.paymentMethod.card.brand
+          secrets.card = response.paymentMethod.card
+          submit()
+
     # Maps the brand returned by Stripe to that required by activemerchant
     mapCC: (ccType) ->
       switch ccType

app/controllers/spree/admin/payment_methods_controller.rb

@@ -110,7 +110,7 @@ module Spree
                      else
                        Gateway.providers.reject{ |p| p.name.include? "Bogus" }.sort_by(&:name)
                      end
-        @providers.reject!{ |p| p.name.ends_with? "StripeConnect" } unless show_stripe?
+        @providers.reject!{ |provider| stripe_provider?(provider) } unless show_stripe?
         @calculators = PaymentMethod.calculators.sort_by(&:name)
       end
 
@@ -134,12 +134,12 @@ module Spree
       # current payment_method is already a Stripe method
       def show_stripe?
         Spree::Config.stripe_connect_enabled ||
-          @payment_method.try(:type) == "Spree::Gateway::StripeConnect"
+          stripe_payment_method?
       end
 
       def restrict_stripe_account_change
         return unless @payment_method
-        return unless @payment_method.type == "Spree::Gateway::StripeConnect"
+        return unless stripe_payment_method?
         return unless @payment_method.preferred_enterprise_id.andand > 0
 
         @stripe_account_holder = Enterprise.find(@payment_method.preferred_enterprise_id)
@@ -147,6 +147,16 @@ module Spree
 
         params[:payment_method][:preferred_enterprise_id] = @stripe_account_holder.id
       end
+
+      def stripe_payment_method?
+        @payment_method.try(:type) == "Spree::Gateway::StripeConnect" ||
+          @payment_method.try(:type) == "Spree::Gateway::StripeSCA"
+      end
+
+      def stripe_provider?(provider)
+        provider.name.ends_with?("StripeConnect") ||
+          provider.name.ends_with?("StripeSCA")
+      end
     end
   end
 end

app/models/spree/gateway/stripe_sca.rb

@@ -0,0 +1,88 @@
+require 'stripe/profile_storer'
+require 'active_merchant/billing/gateways/stripe_payment_intents'
+require 'active_merchant/billing/gateways/stripe_decorator'
+
+module Spree
+  class Gateway
+    class StripeSCA < Gateway
+      preference :enterprise_id, :integer
+
+      validate :ensure_enterprise_selected
+
+      attr_accessible :preferred_enterprise_id
+
+      def method_type
+        'stripe_sca'
+      end
+
+      def provider_class
+        ActiveMerchant::Billing::StripePaymentIntentsGateway
+      end
+
+      def payment_profiles_supported?
+        true
+      end
+
+      def stripe_account_id
+        StripeAccount.find_by_enterprise_id(preferred_enterprise_id).andand.stripe_user_id
+      end
+
+      # NOTE: the name of this method is determined by Spree::Payment::Processing
+      def purchase(money, creditcard, gateway_options)
+        provider.purchase(*options_for_purchase_or_auth(money, creditcard, gateway_options))
+      rescue Stripe::StripeError => e
+        # This will be an error caused by generating a stripe token
+        failed_activemerchant_billing_response(e.message)
+      end
+
+      # NOTE: the name of this method is determined by Spree::Payment::Processing
+      def void(response_code, _creditcard, gateway_options)
+        gateway_options[:stripe_account] = stripe_account_id
+        provider.void(response_code, gateway_options)
+      end
+
+      # NOTE: the name of this method is determined by Spree::Payment::Processing
+      def credit(money, _creditcard, response_code, gateway_options)
+        gateway_options[:stripe_account] = stripe_account_id
+        provider.refund(money, response_code, gateway_options)
+      end
+
+      def create_profile(payment)
+        return unless payment.source.gateway_customer_profile_id.nil?
+
+        profile_storer = Stripe::ProfileStorer.new(payment, provider, stripe_account_id)
+        profile_storer.create_customer_from_token
+      end
+
+      private
+
+      # In this gateway, what we call 'secret_key' is the 'login'
+      def options
+        options = super
+        options.merge(login: Stripe.api_key)
+      end
+
+      def options_for_purchase_or_auth(money, creditcard, gateway_options)
+        options = {}
+        options[:description] = "Spree Order ID: #{gateway_options[:order_id]}"
+        options[:currency] = gateway_options[:currency]
+        options[:stripe_account] = stripe_account_id
+
+        options[:customer] = creditcard.gateway_customer_profile_id
+        creditcard = creditcard.gateway_payment_profile_id
+
+        [money, creditcard, options]
+      end
+
+      def failed_activemerchant_billing_response(error_message)
+        ActiveMerchant::Billing::Response.new(false, error_message)
+      end
+
+      def ensure_enterprise_selected
+        return if preferred_enterprise_id.andand > 0
+
+        errors.add(:stripe_account_owner, I18n.t(:error_required))
+      end
+    end
+  end
+end

app/views/spree/admin/payment_methods/_provider_settings.html.haml

@@ -1,6 +1,9 @@
+= @payment_method
 - case @payment_method
 - when Spree::Gateway::StripeConnect
   = render 'stripe_connect'
+- when Spree::Gateway::StripeSCA
+  = render 'stripe_connect'
 - else
   - if @payment_method.preferences.present?
     %fieldset.alpha.eleven.columns.no-border-bottom#gateway_fields

config/application.rb

@@ -92,6 +92,7 @@ module Openfoodnetwork
       app.config.spree.payment_methods << Spree::Gateway::Migs
       app.config.spree.payment_methods << Spree::Gateway::Pin
       app.config.spree.payment_methods << Spree::Gateway::StripeConnect
+      app.config.spree.payment_methods << Spree::Gateway::StripeSCA
     end
 
     # Settings in config/environments/* take precedence over those specified here.