post https://api.gratifypay.com/partner/2.0/orders//change-payment-method
Update the payment method for a processing order. New Payment method must belong to the same consumerId as the current payment method associated with the order.
If the payment method is of type CREDIT_CARD, supply a valid cvvToken aquired by calling /orders/{orderId}/cvv in Secure PaymentData API.
For a CREDIT_CARD payment method this will also immediately process the next payment.