I am developing while looking at Apple Pay JS API. After calling session.onvalidatemerchant, I am looking for an API for MID authentication on the Apple server. Of course, you can see examples posted by developers on Google, but I want to know where the MID Backend API link is. The JS API I'm looking at has a payment-related API, but the Request Param and the call link are different. Where is Apple's API that specifies the request value for MID authentication? Give me the link. Help me.
Payment related API https://developer.apple.com/documentation/apple_pay_on_the_web/apple_pay_js_api/requesting_an_apple_pay_payment_session