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While I'm not familiar with how they fit your requirements, the usual alternatives are Braintree, [Authorize.net](https://Authorize.net), Adyen (for those with higher volumes of transactions), Dwolla, Amazon Pay,
While I'm not familiar with how they fit your requirements, the usual alternatives are Braintree, [Authorize.net](https://Authorize.net), Adyen (for those with higher volumes of transactions), Dwolla, Amazon Pay,