#pilly_best-practices
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lyric socket
I can't see any way to stop customers adding duplicate cards.
Seems like I'd need to add the payment method to the customer on Stripe, wait for the webhook, compare the fingerprint in our database to any other saved cards, if its a match, remove the card on Stripe?
stone cloak
Stripe doesn't de-duplicate the payment methods saved onto the Customer. This should be managed by your side.
You can use deferred intent flow to create a ConfirmationToken preview the fingerprint of the card on payment_method_preview parameter: https://docs.stripe.com/payments/build-a-two-step-confirmation#create-ct
If the fingerprint doesn't exist on the customer's saved payment method list, then create Setup Intent to save the ConfirmationToken to the customer: https://docs.stripe.com/payments/accept-a-payment-deferred?platform=web&type=setup
lyric socket
thanks
stone cloak
No problem! Happy to help 😄
lyric socket
Should the fingerprint be available in the payment_method_preview?
stone cloak
It should have a fingerprint: https://docs.stripe.com/api/confirmation_tokens/object#confirmation_token_object-payment_method_preview-card-fingerprint
Could you share the confirmation token ID ctoken_123?
lyric socket
ctoken_1S44MJPaVXh0sZieCxvT4v46
I can see the fingerprint if I retrieve it, but it doesn't look like its returned in the confirmationToken.payment_method_preview from stripe.createConfirmationToken()
stone cloak
Yes, this is expected. Stripe doesn't show fingerprint at the client side
fingerprint will only be available when retrieving at server side
lyric socket
gotcha, thanks!
stone cloak
No problem! Happy to help 😄