Introduction

Finix V1 API Official Documentation

Architecture：REST

Data Format：JSON

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

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

Request Headers

Accept : This field is required and must always be set to application/json

Content-Type : This field is required and must always be set to application/json

MerchantID : This field is provided by Finix. Please log in to the Merchant Portal → Settings → API Keys to retrieve it

Signature : SHA512withRSA signature string (Base64 encoded)

Timestamp : Current Unix timestamp (in seconds)

Headers Example：

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

Introduction

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Headers Example：