post
https://api.instellix.io/v2/payment/payment-intents/refund
Accepts a refund Payment Intent for a processed charge Payment Intent.
refundTargetIdent must refer to a charge Payment Intent in status PROCESSED, and amount must be less than or equal to the part of that charge Payment Intent's amount that is not yet refunded.
ident must be unique.
The response contains that ident and status PENDING.