Convert IPB Payment Module from v2.3 to v3.3

Hello i have a payment module script which was made to inegrate into invision power board version 2.3, But i have invision power board version 3.3 so this payment module/script doesnt work on my site, so what i need is the script to be updated to version 3.3 so it works and is compatable with my site. I will provide you the script, all you have to do is edit the php script so that it was with my Invision power board version 3.3 as right now the script i will give you only works and is only compatible with Invision power board version 2.3, Thanks