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This thread is confusing. The title asks for an API for payment gateways, while the thread asks for iDEAL.
I need an API for payment gateways. If that is available then its a small step to adding payment processors with 100+ payment methods, including iDeal.
iDEAL is just the Dutch counterpart of the European e-banking system. e-banking is the most popular payment method in Europe as a whole.