Added parse validation to MerchantPayload

v1.0.5

 Adding parse validation to MerchantPayload (#3)

Some validations and unit tests

v1.0.4

Code style.

Fix usage of DataObject ids

v1.0.3

Fix usage of DataObject id

Missing getters

v1.0.2

Class getters

PHP requirement down to 7.1

v1.0.1

PHP requirement down to 7.1

First release

v1.0.0

EMV documentation