Apple pay Merchant Validation not … | Apple Developer Forums

Apple pay Merchant Validation not giving any response

Hi I am implementing ApplePay using JS. I am on merchant Validation. Sesion is returning me the validation URL which is "https://apple-pay-gateway.apple.com/paymentservices/startSession"

I am using this validation URL in POSTMAN with the parameters explained in the documentation

{
    "merchantIdentifier": "merchant.com",
    "displayName": "abc.com",
    "initiative": "web",
    "initiativeContext": "abc.com"
    
}

But in response I'm getting Socket hung up error. Am I doing anything wrong here?