v1.0.5

Fixed a wrong namespace.

v1.0.4

• Added support for HMAC verfication. Thanks @Cryptic2!

v1.0.3

• Fixed an bug w/ InvalidDataException not existing. StyleCI renamed the class and I did not notice when reviewing it's PR. Rename all instances of InvalidDataException to InsufficientDataException.

v1.0.2

• Added PHPDocs for functions.
• Switched the setMerchantID method to return self.
• Switched the setIPNSecret method to return self.

1.0.1

Fixed PHP error when failed payment status