Remove Migs payment gateway

.rubocop_todo.yml

@@ -396,7 +396,6 @@ Style/CaseEquality:
 Style/ClassAndModuleChildren:
   Exclude:
     - 'app/models/calculator/flat_percent_per_item.rb'
-    - 'app/models/spree/gateway/migs.rb'
     - 'app/models/spree/gateway/pin.rb'
     - 'app/models/tag_rule/discount_order.rb'
     - 'app/models/tag_rule/filter_order_cycles.rb'
@@ -613,7 +612,6 @@ Style/FrozenStringLiteralComment:
     - 'app/models/product_import/unit_converter.rb'
     - 'app/models/proxy_order.rb'
     - 'app/models/schedule.rb'
-    - 'app/models/spree/gateway/migs.rb'
     - 'app/models/spree/gateway/pin.rb'
     - 'app/models/spree/gateway/stripe_connect.rb'
     - 'app/models/spree/preferences/file_configuration.rb'

app/models/spree/gateway/migs.rb

@@ -1,16 +0,0 @@
-module Spree
-  class Gateway::Migs < Gateway
-    preference :login, :string
-    preference :password, :string
-
-    def provider_class
-      ActiveMerchant::Billing::MigsGateway
-    end
-
-    def options_with_test_preference
-      options_without_test_preference.merge(test: preferred_test_mode)
-    end
-
-    alias_method_chain :options, :test_preference
-  end
-end

config/application.rb

@@ -125,7 +125,6 @@ module Openfoodnetwork
 
     # Register Spree payment methods
     initializer "spree.gateway.payment_methods", :after => "spree.register.payment_methods" do |app|
-      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

spec/models/spree/payment_method_spec.rb

@@ -59,7 +59,6 @@ module Spree
 
     it "generates a clean name for known Payment Method types" do
       expect(Spree::PaymentMethod::Check.clean_name).to eq(I18n.t("spree.admin.payment_methods.providers.check"))
-      expect(Spree::Gateway::Migs.clean_name).to eq(I18n.t("spree.admin.payment_methods.providers.migs"))
       expect(Spree::Gateway::Pin.clean_name).to eq(I18n.t("spree.admin.payment_methods.providers.pin"))
       expect(Spree::Gateway::PayPalExpress.clean_name).to eq(I18n.t("spree.admin.payment_methods.providers.paypalexpress"))
       expect(Spree::Gateway::StripeConnect.clean_name).to eq(I18n.t("spree.admin.payment_methods.providers.stripeconnect"))