Short answer
Retrieve the SetupIntent and read last_setup_error for the code and message. Show the customer a clear message, then confirm the same SetupIntent again with a new payment method. Don’t keep retrying the one that failed.
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Why the setup attempt failed, and the fix
01
The reason was never read
“Check the last_setup_error property on the SetupIntent for more details, and provide a new payment method to attempt to set it up again.” Stripe, Error codes (setup_attempt_failed)
The error itself only says the attempt failed. The decline code, an authentication failure or another reason sits in last_setup_error on the SetupIntent, so log it with the SetupIntent ID.
02
The same payment method is tried again
“provide a new payment method to attempt to set it up again.” Stripe, Error codes (setup_attempt_failed)
Stripe’s guidance is to provide a new payment method rather than retry the one that failed. Ask the customer for another card or bank account and confirm the SetupIntent with it.
03
The app only checks for an exception
Code that treats any SetupIntent without an exception as saved can miss a failure. Check the SetupIntent status and only treat the payment method as saved once it is succeeded.
04
A failed authentication looks like a decline
Also check: if last_setup_error points to authentication, the payment method failed the bank’s check. Stripe’s related code, setup_intent_authentication_failure, also says to provide a new payment method, so ask for another card or bank account.
Checked against the vendor’s docs on : Stripe docs: Error codes; Stripe API: The SetupIntent object.
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Related: Stripe setup_intent_authentication_failure · Stripe no default payment method · Stripe customer_max_payment_methods · Stripe webhook delivery failed