#yogeshbhagat
primal thistle
errant cove
There's no built-in method for this. You'd need to keep track of PaymentMethod fingerprints yourself and compare when customer tries to provide same info
Support article
https://support.stripe.com/questions/how-can-i-detect-duplicate-cards-or-bank-accounts
We have a video guide too
https://www.youtube.com/watch?v=MvMmOWWHjVo