Braintree Blue: Allow unstoring just a credit card

Unfortunately the Braintree implementation of store/unstore/update was
originally made very customer-centric where ActiveMerchant is credit
card centric. This means that #unstore expects a customer id rather than
a credit card token. To at least allow unstoring a card only, this
allows passing a credit card token for removal; the customer id must be
passed as nil for it to work, though.

CHANGELOG

@@ -8,6 +8,7 @@
 * Braintree Blue: Allow specifying the customer id [ntalbott]
 * Braintree Blue: Scrub invalid emails and zips [ntalbott]
 * Braintree Blue: Return :credit_card_token as a top level param [ntalbott]
+* Braintree Blue: Allow unstoring just a credit card [ntalbott]
 
 == Version 1.42.2 (November 13th, 2013)
 

lib/active_merchant/billing/gateways/braintree_blue.rb

@@ -168,7 +168,11 @@ def update(vault_id, creditcard, options = {})
 
       def unstore(customer_vault_id, options = {})
         commit do
-          @braintree_gateway.customer.delete(customer_vault_id)
+          if(!customer_vault_id && options[:credit_card_token])
+            @braintree_gateway.credit_card.delete(options[:credit_card_token])
+          else
+            @braintree_gateway.customer.delete(customer_vault_id)
+          end
           Response.new(true, "OK")
         end
       end

test/remote/gateways/remote_braintree_blue_test.rb

@@ -366,7 +366,7 @@ def test_failed_add_to_vault
     assert_equal nil, response.params["customer_vault_id"]
   end
 
-  def test_unstore
+  def test_unstore_customer
     assert response = @gateway.store(@credit_card)
     assert_success response
     assert_equal 'OK', response.message
@@ -375,6 +375,15 @@ def test_unstore
     assert_success delete_response
   end
 
+  def test_unstore_credit_card
+    assert response = @gateway.store(@credit_card)
+    assert_success response
+    assert_equal 'OK', response.message
+    assert credit_card_token = response.params["credit_card_token"]
+    assert delete_response = @gateway.unstore(nil, credit_card_token: credit_card_token)
+    assert_success delete_response
+  end
+
   def test_unstore_with_delete_method
     assert response = @gateway.store(@credit_card)
     assert_success response