Some Visa Developer APIs require an API Key-Shared Secret Authentication, which Visa refers to as x-pay-token. Watch this Visa Dev Webinar to learn what a HTTP Request is - what do the body and headers look like? To help understand why we use x-pay-token. You’ll also get an overview of which APIs require X-Pay Token (save time spent on research for testing).
We wrap things up with a demo of X-Pay Token that tests connection using Postman.