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I have had good experiences with RocketGate, Epoch, CCBill, and PrimeOrange. I just learned about Inovio and Plisio, and it looks like they have good developer resources.
RocketGate has an excellent SDK available on Github, which definitely makes it easy to integrate.
I support those four with my content, affiliate, and customer relationship management systems that I build, so I figure it'll be easy for you to include the ones in that list you don't already have.
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