*  Fixed Duplicate conditional expression in PayPalCredentialManager.php [#594](https://github.com/paypal/PayPal-PHP-SDK/pull/594).
*  Updated Invoicing APIs [#605](https://github.com/paypal/PayPal-PHP-SDK/pull/605).
*  Fixed PSR code style errors [#607](https://github.com/paypal/PayPal-PHP-SDK/pull/607).
This tag has no release notes.