Changes to Update a braintree payment

added the new required request property data/relationships/order/data

request property data/type was restricted to a list of enum values

removed the request property data/relationships/order/id

removed the request property data/relationships/order/type

the request property data/attributes/metadata became nullable

the request property data/attributes/options became nullable

the request property data/attributes/payment_id became nullable

the request property data/attributes/payment_method_nonce became nullable

the request property data/attributes/reference became nullable

the request property data/attributes/reference_origin became nullable

the type request property default value braintree_payments was removed

added the new braintree_payments enum value to the request property data/type

added the media type application/vnd.api+json for the response with the status 200