Add button to send test data to endpoint

It will allow a user to easily test the endpoint

app/controllers/webhook_endpoints_controller.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class WebhookEndpointsController < BaseController
-  before_action :load_resource, only: :destroy
+  before_action :load_resource, only: [:destroy, :test]
 
   def create
     webhook_endpoint = spree_current_user.webhook_endpoints.new(webhook_endpoint_params)
@@ -25,6 +25,55 @@ class WebhookEndpointsController < BaseController
     redirect_to redirect_path
   end
 
+  def test # rubocop:disable Metrics/MethodLength
+    at = Time.zone.now
+    test_payload = {
+      payment: {
+        updated_at: at,
+        amount: 0.00,
+        state: "completed"
+      },
+      enterprise: {
+        abn: "65797115831",
+        acn: "",
+        name: "TEST Enterprise",
+        address: {
+          address1: "1 testing street",
+          address2: "",
+          city: "TestCity",
+          zipcode: "1234"
+        }
+      },
+      order: {
+        total: 0.00,
+        currency: "AUD",
+        line_items: [
+          {
+            quantity: 1,
+            price: 20.00,
+            tax_category_name: "VAT",
+            product_name: "Test product",
+            name_to_display: "",
+            unit_to_display: "1kg"
+          }
+        ]
+      }
+    }
+
+    WebhookDeliveryJob.perform_later(@webhook_endpoint.url, "payment.completed", test_payload, at:)
+
+    flash[:success] = t(".success")
+    respond_with do |format|
+      format.turbo_stream do
+        render turbo_stream: turbo_stream.update(
+          :flashes, partial: "shared/flashes", locals: { flashes: flash }
+        )
+      end
+    end
+  end
+
+  private
+
   def load_resource
     @webhook_endpoint = spree_current_user.webhook_endpoints.find(params[:id])
   end