Gateways
Issue a general credit (reserved, not implemented)
Reserved endpoint for crediting a payment method without a prior
transaction (a standalone credit). Not implemented: every request
returns 501 with an error envelope and performs no work.
Authentication is still enforced, so 401/403 apply before the
501. To refund an existing transaction, use the transaction credit
endpoint instead.
POST
Issue a general credit (reserved, not implemented)
Authorizations
Merchant API key (fp_live_* for live, fp_test_* for sandbox) or an
admin-tier JWT (company admin or root admin). Non-admin JWTs are
rejected with 403; live API keys additionally require the merchant's
API access to be enabled.
Path Parameters
Gateway slug