Using this script you can manage the many payment gateways using one codebase. Also you can use these payment gateways in shopping cart, Invoice billing, bill payments like other e-commerce website as per your convenience.

Demo
https://codecanyon.net/item/paypage-php-ready-to-use-payment-gateway-integrations/24695122

Download
https://www.filecad.com/inwR/PayPage-v1.3.0---PHP-ready-to-use-Payment-Gateway-Integrations.rar