Add customer_credit scope

app/models/spree/payment_method.rb

@@ -52,6 +52,10 @@ module Spree
         .where(environment: [Rails.env, "", nil])
     }
 
+    def self.customer_credit
+      find_by(name: Rails.application.config.credit_payment_method[:name])
+    end
+
     def configured?
       !stripe? || stripe_configured?
     end

app/models/spree/payment_method/customer_credit.rb

@@ -54,9 +54,7 @@ module Spree
       private
 
       def payment_method
-        Spree::PaymentMethod.find_by(
-          name: Rails.application.config.credit_payment_method[:name]
-        )
+        Spree::PaymentMethod.customer_credit
       end
 
       def error_response(translation_key)

app/services/credit_payment_method/linker_service.rb

@@ -44,7 +44,7 @@ module CreditPaymentMethod
     end
 
     def credit_payment_method
-      Spree::PaymentMethod.find_by(name: Rails.application.config.credit_payment_method[:name])
+      Spree::PaymentMethod.customer_credit
     end
 
     def create_credit_payment_method

spec/services/credit_payment_method/linker_service_spec.rb

@@ -42,9 +42,7 @@ RSpec.describe CreditPaymentMethod::LinkerService do
         )
         expect(api_payment_method.display_on).to eq("back_end")
 
-        credit_payment_method = Spree::PaymentMethod.find_by(
-          name: Rails.application.config.credit_payment_method[:name]
-        )
+        credit_payment_method = Spree::PaymentMethod.customer_credit
         expect(credit_payment_method).not_to be_nil
         expect(credit_payment_method.description).to eq(
           Rails.application.config.credit_payment_method[:description]