post https://api.flexpay.io/v1/gateways
Create a payment gateway to process transactions in the authenticated environment. Gateways are created using the "settings" required for that gateway, meaning each call is slightly different depending on the gateway’s API requirements. The examples here use Stripe and NMI, but any supported gateway will have a similar call.
If the "acceptedCards" object is not included, all cards will be accepted by default.