What's a good approach to handling support for multiple payment processors, with minimal tinkering?
Are there any existing libraries or services that abstract out the many differences between payment processors? I'm looking to write minimal server-side code, if any. Turn-key solutions (i.e. the sort of thing Stripe.js provides, but for other processors) would be ideal.
It doesn't need to be free, but free is good.
All I would need is for any payment completion to trigger a callback URL, and my server would handle the rest. I don't need subscriptions or anything fancy, really.
This must be a very common problem, but I can't really find anything that hits all these sweet spots.
Hell, even a simple HTML/JS generator that wires most stuff up for you would be nice.
There are a few for Django, but none that I know of that have the full range that ActiveMerchant does.
Another option is to look for processors with an iframe solution like Stripe Checkout or WePay Iframe Checkout (I think PayPal used to have one but they may have killed it). The nice thing about these solutions is that they take care of 100% of the payment form and annoying stuff like AVS, luhn validation, error response handling, etc.
Good luck! Payments is hard.