Dear apple I can’t see any options to apply apple titanium card on wallet

How did you get Apple Titanium Card in Sri Lanka?

Apple Pay isn't available in Sri Lanka.

Ok first of all, none of us here work for apple. This is a User-to-user forum. And, as @SvranKrA posted, you cannot get Apple Card in Sri Lanka

Add Apple Card to your iPhone

On your iPhone, open the Wallet app. Tap the add button. Tap Add Card, then follow the steps to select Apple Card. If you're asked to add the card that you use with your Apple ID, cards on other devices, or cards that you've recently removed, choose Apple Card.

How to add Apple Card to your Apple devices - Apple Support

Apple pay cash Countries

You can add your credit, debit, or prepaid cards from participating banks and card issuers in these countries and regions:

Countries and regions that support Apple Pay

Do you have Apple Cards?

No comment

That is almost certainly not legal