Upgraded Braintree integration to support new fields

Spreedly has upgraded the Braintree integration to 4.34.0. This update is backward compatible. Merchants can now leverage support for metadata field like payment_account_reference, and Improved library compatibility and XML parsing for more robust transaction processing.

No code changes are required for existing integrations. For more information on using Braintree with Spreedly, please see the Braintree gateway guide.