* Started working on a merge of the payson direct and invoice module to reduce the code base
* Continued the work on integrating invoice and direct module into one
* Fixed IPN so it actually works
* Removed the invoice files
* Fixed some functionality to be able to update Payson invoices from store admin
* Fixed some language strings
* Some code formatting
* Renamed the payment method in admin
* Added some logic for how and when to display Payson Direct & Invoice
* Major refactoring of code
* Fixed an issue with invoice fee not being added to invoice in zencart
* Improved the display in checkout. If there is only one payment method, direct or invoice, this is presented with one radio button instead of two to avoid confusion
* Changed so the complete zencart version number is sent to Payson
* Removed a configuration option
* Cleaned up the IPN-file