Authentication

Merchant credentials

Every request must include the following HTTP headers. Credentials are issued per merchant from the RezolvePay admin portal.

• X-Merchant-Id — the merchant short identifier (e.g. leon)
• X-Merchant-Api-Key — the merchant API key

Exception: checkout widget-token mode authenticates with widget_token and does not require merchant auth headers (X-Merchant-Id, X-Merchant-Api-Key).