Fix Braintree checkout helpers

app/controllers/solidus_paypal_braintree/admin_payments_controller_decorator.rb

@@ -0,0 +1,10 @@
+module SolidusPaypalBraintree
+  module AdminPaymentsControllerDecorator
+
+    def self.prepended(base)
+      base.helper ::SolidusPaypalBraintree::BraintreeAdminHelper
+    end
+
+    ::Spree::Admin::PaymentsController.prepend(self)
+  end
+end

app/controllers/solidus_paypal_braintree/orders_controller_decorator.rb

@@ -0,0 +1,10 @@
+module SolidusPaypalBraintree
+  module OrdersControllerDecorator
+
+    def self.prepended(base)
+      base.helper ::SolidusPaypalBraintree::BraintreeCheckoutHelper
+    end
+
+    ::Spree::OrdersController.prepend(self)
+  end
+end

app/helpers/solidus_paypal_braintree/braintree_admin_helper.rb

@@ -0,0 +1,20 @@
+module SolidusPaypalBraintree
+  module BraintreeAdminHelper
+    # Returns a link to the Braintree web UI for the given Braintree payment
+    def braintree_transaction_link(payment)
+      environment = payment.payment_method.preferred_environment == 'sandbox' ? 'sandbox' : 'www'
+      merchant_id = payment.payment_method.preferred_merchant_id
+      response_code = payment.response_code
+
+      return unless response_code.present?
+      return response_code unless merchant_id.present?
+
+      link_to(
+        response_code,
+        "https://#{environment}.braintreegateway.com/merchants/#{merchant_id}/transactions/#{response_code}",
+        title: 'Show payment on Braintree',
+        target: '_blank'
+      )
+    end
+  end
+end

app/helpers/solidus_paypal_braintree/braintree_checkout_helper.rb

@@ -40,5 +40,8 @@ def braintree_3ds_options_for(order)
       }
     end
 
+    def paypal_button_preference(key, store:)
+      store.braintree_configuration.preferences[key]
+    end
   end
 end

spec/helpers/braintree_admin_helper_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-RSpec.describe BraintreeAdminHelper do
+RSpec.describe SolidusPaypalBraintree::BraintreeAdminHelper do
   describe '#braintree_transaction_link' do
     let(:payment_method) { create_gateway }
     let(:payment) do