This is one of the reasons why Garmin Pay is pretty useless here. Most banks only support it with credit cards and a lot of stores do not take credit card-based contactless payments (with some exceptions like e.g. Jumbo and Decathlon).
The reason is that debit cards have been the standard cards since the beginning. Nowadays more people have a credit card for online shopping outside the country, etc. But when I was young my dad had a credit card and that was fairly exceptional.
I'd buy myself a shitload of rupees if they were still around. Such a missed chance.