taylor-source-fingerprint | Stripe Developers | Page 1

vernal haven Jan 29, 2022, 12:03 AM

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the fingerprint can change because for example a card can be automatically updated after it's renewed by the bank. It's based on the card number so if the card number changes, so would the card fingerprint

proven notch Jan 29, 2022, 12:04 AM

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what if the payment source is a bank account?

vernal haven Jan 29, 2022, 12:04 AM

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same, the underling account number/routing number could be automatically updated so that could change, though that's a lot rarer

proven notch Jan 29, 2022, 12:05 AM

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If the fingerprint changes, is there a webhook we could listen to?

vernal haven Jan 29, 2022, 12:05 AM

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there are a variety of events depending on your integration. If you're using ACH debit it'd be customer.source.updated

proven notch Jan 29, 2022, 12:06 AM

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Yeah we're seeing bank account fingerprints update and the account number/routing number are the same

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Are there any other pieces of data besides routing/account number that are factors for a fingerprint?

vernal haven Jan 29, 2022, 12:07 AM

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you can't know the account number at all in the API

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it might be easier to start from a clear example, you seem to have a concrete question behind the hypothetical one

proven notch Jan 29, 2022, 12:08 AM

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req_4NaELdU2lbxRhv

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That response shows an id of ba_1IPVtxLMHLcGMW3QLH09xrUD and a fingerprint of V800nnkhlbZH9PUL

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When I look at the fingerprint for that same resource today, it is: P8DiSIfG53KSwCsX

vernal haven Jan 29, 2022, 12:13 AM

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https://dashboard.stripe.com/events/evt_1IQeXMLMHLcGMW3Qc5iV1cRr

proven notch Jan 29, 2022, 12:13 AM

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yep i see it

vernal haven Jan 29, 2022, 12:14 AM

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so that's the event you want to listen for, that's what I explained right?

proven notch Jan 29, 2022, 12:14 AM

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yep! that squares me away.

vernal haven Jan 29, 2022, 12:14 AM

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it's rare that the fingerprint changes without something else changing

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but imagine if their account number was 111112222 and the bank moved them to 333332222 then the last 4 are still 2222 so in the API nothing changes, but the fingerprint calculated on the underlying account number is different

proven notch Jan 29, 2022, 12:15 AM

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We are seeing this happen a handful of times with bank accounts, seems weird

vernal haven Jan 29, 2022, 12:15 AM

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sometimes it's people moving to a higher threshold with their banking and they have logic to keep "same number but starts with an extra 1" or something

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but agreed that's weird, I've rarely seen this

proven notch Jan 29, 2022, 12:17 AM

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I suppose the more volume and transactions you process, the more you see weird edge cases.

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🤷‍♂️

vernal haven Jan 29, 2022, 12:17 AM

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yeeeeep

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thanks for the examples that really helps

proven notch Jan 29, 2022, 12:18 AM

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Sure thing. We know what to do now. Thanks for the help.

#taylor-source-fingerprint