Buying coins via card

Hello buddies, I am new, and just looking for some hints, not necessary solutions!

I am a about to make a site, where my users can buy ‘coins’ on my website which they can spend on goods.

I got a PHP registration/login system using PDO. Now I would like my users to be able to buy coins via credit card. Should I store those coins in a variable in database, or how should this be handled? (here i’m also thinking about security).

Anyone have some ideas how to proceed from my current point?

Thanks in advance, and have a good day,

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