Update Braintree implementation for certification #79

Job	Run time
integration_test / jdk-11 mysql2	4m 36s
integration_test / jdk-11 postgresql	3m 7s
ci / jdk-11 travis	1m 54s
ci / verify	57s
ci / jdk-11 integration-postgresql	59s
ci / jdk-11 integration-mysql	58s
ci / jdk-17 integration-mysql	57s
ci / jdk-11 travis	3s
ci / jdk-17 integration-postgresql	57s
ci / jdk-17 travis	43s
	15m 11s

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