SP Plus (SP PLUS savings Paypal Check) is a payment system which is already available for Joomla, PrestaShop and Mangeto as an extension (3rd party module) and I need it installed for my Open Cart site. Studying the attached 3 files and the code of Joomla/PrestaShop/Magento will help you complete this project quickly and affordably as I am on a budget. Start your message with the word payment module and give a good bid.
I own all the rights to the developed module. You must not sell, share, give for free, display this module once its developed. If you do share it, we will find out.
Possibly more work in future for selected developer.
PS: Do view the ATTACHED ZIPPED FOLDER.
Attached is extra info.