Who are the payment processing technology platforms?
I'm trying to aggregate all the options for those looking to build payments apps and services.seems to be the most innovative, and I'm not looking to refute that (unless it's definitely not), I just want to consider everything that's out there.
Added edit: I'm not looking for payment services like Square, Google Wallet, or ISIS. Also not looking for payment Gateways like WePay, Braintree, Intuit's solutions, etc. I'm looking for the technology platforms on which payment can be innovated and built.