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
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This file has UNTOUCHED status – (original developer code without any tampering done)