Where the credit card information stores in Spark ?

I don't know because I've never used Spark. But it's highly likely it isn't.

Storing credit card numbers isn't something you should do. EVER!

The numbers are probably stored by the payment provider and you'll need to pass some sort of key with transactions.

Stripe manage the credit card. If you want to store them you need to do a lot of things to be legally autorize to do it.

@topvillas @Vineky Thankyou for the advice guys. @topvillas you are right i should never do that.