Integrate secure payments processors

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Hello i am from and 

we are a startup building a lot of plugins to connect payment processors with ecommerce platforms

we are interested in integrate  popular and secure payment processors with shopify like BAC CREDOMATIC, PAGO EFECTIVO, STRIPE (with new features like: visa checkout, apple pay and others) between others


what are the steps we have to follow to do it??? 


those payments processors are very popular and safest, 


please advise us!


Thanks a lot