[#1897] - use RequestBuilder to build TransactionRequest
[#1897] - use RequestBuilder to build TransactionRequest

scottmeyer/braintree_dotnet,scottmeyer/braintree_dotnet,ronin1/braintree_dotnet,braintree/braintree_dotnet,scottmeyer/braintree_dotnet,ronin1/braintree_dotnet,scottmeyer/braintree_dotnet,ronin1/braintree_dotnet,braintree/braintree_dotnet