I'm quite new to the technology of payment gateways or payment processors, but I would like to create such a platform from scratch . Any information, regardless of whether code , links, or template, would be greatly appreciated. I would like to create a platform to facilitate and process payments from different banks . Note : Please don't recommend already made platforms like PayPal , Alipay, Google Pay, etc. My point is to try to make something like that . I would accept templates from any programming language.