# Is the Card fingerprint consistent across sellers who authorise the same OAuth app?

**URL:** <https://developer.squareup.com/forums/t/is-the-card-fingerprint-consistent-across-sellers-who-authorise-the-same-oauth-app/28022>\
**Category:** Questions\
**Tags:** customers-api, payments-api, cards-api\
**Created:** [September 28, 2026, 11:14pm UTC](https://developer.squareup.com/forums/t/is-the-card-fingerprint-consistent-across-sellers-who-authorise-the-same-oauth-app/28022 "2026-09-28T23:14:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![efacts\_founders](https://avatars.discourse-cdn.com/v4/letter/e/f0a364/32.png) [@efacts\_founders](https://developer.squareup.com/forums/u/efacts_founders)\
**Post date:** [September 28, 2026, 11:14pm UTC](https://developer.squareup.com/forums/t/is-the-card-fingerprint-consistent-across-sellers-who-authorise-the-same-oauth-app/28022/1 "2026-09-28T23:14:39Z")

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Hi Square team,

I’m building E-Facts (efacts.ca), a Canadian digital receipts app that sellers will connect through OAuth. We read Payments and Orders data to generate digital receipts for shoppers. I have a few questions about `card_details.card.fingerprint`:

1. The Card object docs describe the fingerprint as identifying a card “across multiple locations within a single application.” Does that mean the fingerprint is **identical for the same card across different sellers** who authorise our app, or is it specific to each seller?
2. Is the fingerprint present on **Interac card-present payments** in Canada?
3. Is the fingerprint the same for a physical card and the same card used through **Apple Pay or Google Pay** , or different because of the device token?
4. Can an App Marketplace app add a **QR code or link to Square’s digital or printed receipts** , or capture the buyer’s phone number or email, so we can deliver the receipt?

We never store card numbers. The fingerprint would be hashed and used only after a shopper has explicitly opted in to link their card to their receipt wallet.

Thanks in advance!  
Luvraj Tyagi, Founder, E-Facts Inc. ([info@efacts.ca](mailto:info@efacts.ca))

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**Author:** ![efacts\_founders](https://avatars.discourse-cdn.com/v4/letter/e/f0a364/32.png) [@efacts\_founders](https://developer.squareup.com/forums/u/efacts_founders)\
**Post date:** [September 28, 2026, 11:21pm UTC](https://developer.squareup.com/forums/t/is-the-card-fingerprint-consistent-across-sellers-who-authorise-the-same-oauth-app/28022/2 "2026-09-28T23:21:56Z")

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Quick update after searching the forum: I found the answers to Q1 and Q3 in earlier threads (#14586, #11704, #20188). Fingerprints are specific to each seller, and digital wallets produce different fingerprints. Could you confirm that’s still accurate in 2026?

That leaves two open questions:

1. Is `card_details.card.fingerprint` populated for **Interac** card-present payments in Canada?
2. Is there any supported way for an app to add a **QR code, link or custom text** to Square’s printed or digital receipts, or to receive the buyer’s receipt email or phone number through the API (with the buyer’s consent)?

Thanks!

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**Author:** ![jseok](https://avatars.discourse-cdn.com/v4/letter/j/f475e1/32.png) [@jseok](https://developer.squareup.com/forums/u/jseok)\
**Post date:** [September 29, 2026, 3:57pm UTC](https://developer.squareup.com/forums/t/is-the-card-fingerprint-consistent-across-sellers-who-authorise-the-same-oauth-app/28022/4 "2026-09-29T15:57:08Z")

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Your conclusions are correct and still hold today.

1. Yes - Interac payments include the fingerprint.
2. No receipt-template API exists for injecting a QR code image into Square’s native printed or digital receipts.