I believe 4.0.4 (and if so 3.8.6) you should add a Discount option to the Payment system and maybe a area (Page) to add new Payment options like Onebip aswell as Paypal, moneybrookers etc maybe other options like aswell as a discount option a addon to add Sms Tokens.
Just idea to increase the payment area, becuase on VB.org there is a mod but it doesnt work and people getting annoyed because the developer hasnt been on for ages. so i thought maybe you could include it in the future developments.
__DEFINE_LIKE_SHARE__