Only start payment if email is not empty.
WordPress Coding Standards optimizations.
Updated change log.
Fixed indent with spaces.
Tweak - Membership Premium - Added support for version 3.5.1.1.
Improved some documentation.
Only set transaction ID on return.
Changed plugin URI to HappyWP.
Changed plugin URI to HappyWP.
Tested plugin up to WordPress version 3.9.
Merge branch 'develop' of https://github.com/pronamic/wp-pronamic-ideal into develop
Moved change log.
Updated change log.
Added an link to the new Gravity Forms GitHub repository.
Improved WPMU DEV Membership payment data class.
Added an GitHub URI to the new Membership Premium repository by Pronamic.
Updated tested up to value of WPMU DEV Membership.
Improved documentation.
Improved documentation.
Store the payment ID with the data object.