Don't forget to download Payment System FIRST and install it before the Donation System Add-On. Here is the link to Payment System:
https://vborg.vbsupport.ru/showthread.php?p=1454525
I HAVE TO MAKE THIS VERY CLEAR!! IT WILL NOT EFFECT ANY CURRENT DONATION OR PAYMENT SYSTEMS YOU HAVE. Have no fear when installing. Your below mods will be unaffected by the new system.
Easy to Transfer Payments From:
Cyb - PayPal Donate
PayPal Donations For vBulletin 3.5.0
It is automatic when you run the install to transfer the payments to the new system still leaving the other modifications alone. This software in no way interferes in the other mods above so you can keep them installed and active while testing and merging over.