Introduction

Finix V1 API documentation

Architecture: REST

Payload format: JSON

Sandbox base URL:https://secure-staging.finixpayment.com/

Production base URL:https://secure.finixpayment.com/

Request headers

Accept : Required; must always be application/json.

Content-Type : Required; must always be application/json.

MerchantID : Provided by Finix. Find it in Merchant Dashboard → Settings → API keys.

Signature : SHA512withRSA signature (Base64-encoded).

Timestamp : Current Unix timestamp (seconds).

Example headers:

{
    "Accept": "application/json",
    "Content-Type": "application/json",
    "MerchantID": "FX100001",
    "Signature": "7QbwLbLsS0MAVK3RizeDrNrHZYsKheOVE5yrzH2ectK6uwwT3RMtEJjXHaYi2BFcNUuqMqVknbOc0eIatK0r8BQT87i3U60pvVBblrPG02QkHBJYGBel2pH09oUZ0BNSsphZADxvQqTUVkTXbdaBIZYo8GGY3m96Rb5vUToKEzQ66cm3bduhuxjXf12gXoEgoPFQ8vlpXOAlMxQ5ARMylmNv25Ov29gidi4Z0qjimu96FSWcnxcXvIZfQD7HMzhC",
    "Timestamp": "1750553505",
}

Example headers:#

Example headers: