Getting started on Visa Developer using API key - Shared Secret (X-Pay-Token).

Some Visa APIs require API Key – Shared Secret authentication, which Visa refers to as X-Pay-Token. To invoke an API using X-Pay-Token, you will need an API Key and a Shared Secret, which is provided on the application details page as mentioned in the introduction.

To successfully invoke Visa APIs using X-Pay-Token , your application needs to do the following:

Include the API Key as a query parameter
Include the Accept and X-Pay-Token in the request header as shown in the sample below

To get set up, navigate to:
https://developer.visa.com/vdpguide#x_pay_token