bhai jab pata ni hai to ku bol rahe ho
Please refer to t&c, try applying any card before submitting and look for a point states, please confirm if that you are Indian resident.
Check eligibility
https://www.hdfcbank.com/personal/pay/cards/credit-cards/diners-club-black/eligibility
it does apply for paytm account as well, your pan card
try sending email to hdfc customer care that you have now nri status, and all your existing cards will be cancelled without any further question.
as a nri, you need to file itr so your income tax department know that your pan will be use for nri.