Base Pay backend confirmation #825
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✅ Heimdall Review Status
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montycheese
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Jan 15, 2026
| }>(); // In production, use a persistent database | ||
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| export async function verifyAndFulfillPayment( | ||
| txId: string, |
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Typically the developer would call this type of endpoint with some user auth token of the payer (whether its the SIWE payload, or a JWT from an auth management platform). I would suggest passing a field like payerAddress to this function, and then do a validation that the sender that you get from getPaymentStatus matches the expected payerAddress, so a malicious caller does not try to send someone else's payment to fulfill their order.
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Good callout - I think our solve for this right now is the dataCallback context - where the orderID passes to the wallet and then directly to the backend service with the payment ID now associated with the orderID.
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What changed? Why?
Following some feedback from the community, adding more details to the Base Pay guide to improve backend verification and replay attack protection