Hi , how i can add a master card as my apple pay?

Hi Shivatavasuli.

welcome too the Apple Community

Wondering if you are using iPhone, Mac Computer or other device.

To add a master card to wallet to use with Apple Pay,

try the steps given in the article below (blue link):

Eg: Scroll to

How to add a debit or credit card on your iPhone

or

How to add a debit or credit card for Apple Pay on your Mac or iPad

Set up Apple Pay

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If needed:

What to do: If you can't add a card to Apple Wallet to use with Apple Pay – Apple Support

or

Apple Pay Support Webpage:

Apple Pay - Official Apple Support

All the best :-)