Send billing address with credit card transactions

app/models/solidus_paypal_braintree/gateway.rb

@@ -265,6 +265,10 @@ def transaction_options(source, options, submit_for_settlement = false)
         params[:shipping] = braintree_shipping_address(options)
       end
 
+      if source.credit_card?
+        params[:billing] = braintree_billing_address(options)
+      end
+
       if source.customer.present?
         params[:customer_id] = source.customer.braintree_customer_id
       end
@@ -273,7 +277,14 @@ def transaction_options(source, options, submit_for_settlement = false)
     end
 
     def braintree_shipping_address(options)
-      address = options[:shipping_address]
+      braintree_address_attributes(options[:shipping_address])
+    end
+
+    def braintree_billing_address(options)
+      braintree_address_attributes(options[:billing_address])
+    end
+
+    def braintree_address_attributes(address)
       first, last = address[:name].split(" ", 2)
       {
         first_name: first,

spec/models/solidus_paypal_braintree/gateway_spec.rb

@@ -18,6 +18,7 @@
       payment_type: payment_type
     )
   end
+
   let(:payment_type) { SolidusPaypalBraintree::Source::PAYPAL }
 
   describe "saving preference hashes as strings" do
@@ -115,6 +116,7 @@
     end
 
     let(:currency) { 'USD' }
+
     let(:gateway_options) do
       {
         currency: currency,
@@ -126,6 +128,15 @@
           state: "CA",
           zip: "90210",
           country: "US"
+        },
+        billing_address: {
+          name: "Dick Grayson",
+          address1: "15 Robin Walk",
+          address2: "Apt 123",
+          city: "Blüdhaven",
+          state: "CA",
+          zip: "90210",
+          country: "US"
         }
       }
     end
@@ -210,6 +221,27 @@
           end
         end
       end
+
+      context "CreditCard transaction", vcr: { cassette_name: 'gateway/authorize/credit_card/address' } do
+        let(:payment_type) { SolidusPaypalBraintree::Source::CREDIT_CARD }
+
+        it 'includes the billing address in the request' do
+          expect_any_instance_of(Braintree::TransactionGateway).
+          to receive(:sale).
+          with(hash_including({
+            billing: {
+              first_name: "Dick",
+              last_name: "Grayson",
+              street_address: "15 Robin Walk Apt 123",
+              locality: "Blüdhaven",
+              postal_code: "90210",
+              region: "CA",
+              country_code_alpha2: "US"
+            }
+          })).and_call_original
+          authorize
+        end
+      end
     end
 
     describe "#capture", vcr: { cassette_name: 'gateway/capture' } do