salim-bt_ece-errors | Stripe Developers | Page 1

wheat treeBOT Jun 9, 2025, 2:05 PM

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fiery anchor Jun 9, 2025, 2:10 PM

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to use*

velvet crest Jun 9, 2025, 2:11 PM

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Hi, is this what you're looking for, https://docs.stripe.com/elements/express-checkout-element/accept-a-payment#create-ct ?

fiery anchor Jun 9, 2025, 2:13 PM

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thanks , i have Q
This means that the frontend indicates the cost for payment. This means that the user can change the cost through the console. This means that I can get less than necessary on the backend.

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and
What will happen if the user paid, but the frontend did not send a request to the backend? Will the payment be lost?

velvet crest Jun 9, 2025, 2:15 PM

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What do you mean by that? Can you provide more details here?

fiery anchor Jun 9, 2025, 2:16 PM

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the front creates the confirmation token and send it to backend right?

wheat treeBOT Jun 9, 2025, 2:16 PM

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velvet crest Jun 9, 2025, 2:18 PM

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The confirmation toke is created on the front-end, sure. What does 'send it to backend right' mean? You can access that information to use it on the server-side call. I do not think I fully understand the question sorry

fiery anchor Jun 9, 2025, 2:20 PM

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ok Q The cost calculated by the frontend 100% will not be the same as the backend calculates. The cost is calculated before opening the ui wallet. It's time, cents can change. How will the backend check the correctness of the payment amount?

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who indicates the cost for payment?

velvet crest Jun 9, 2025, 2:23 PM

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Why do you say that the Stripe fees will differ? Or, are you referring to the amount changing on your end?

fiery anchor Jun 9, 2025, 2:23 PM

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yes about the amount changing on my end

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What will happen if the user paid, but the frontend did not send a request to the backend? Will the payment be lost?
If the user closed the tab, the Internet on the phone disappeared etc?

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Or will the payment not be debited without confirmation on the backend?

fathom dragon Jun 9, 2025, 2:28 PM

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Hi there 👋 jumping in as my teammate needs to step away. You control the amount of the payment.

For an Express Checkout Element flow, the actual payment is processed when the Payment Intent is confirmed, which is done in Step 7 of the guide my teammate provided.

If your code doesn't reach that point, then no payment is processed.

fiery anchor Jun 9, 2025, 2:29 PM

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ok What if this token is stolen? We are talking about the frontend

fathom dragon Jun 9, 2025, 2:33 PM

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Nothing as far as I'm aware. Are you seeing something in your testing that is giving you concern that isn't the case?

fiery anchor Jun 9, 2025, 2:35 PM

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ok and What will happen in 12 hours?

fathom dragon Jun 9, 2025, 2:36 PM

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Huh? What do you mean?

fiery anchor Jun 9, 2025, 2:36 PM

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if unused, it expires after 12 hours?

fathom dragon Jun 9, 2025, 2:37 PM

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You can test all of this in testmode and see exactly how our system behaves. You can use the test cards listed here to help with that testing:
https://docs.stripe.com/testing

Test card numbers

Use test cards to validate your Stripe integration without moving real money. Test a variety of international scenarios, including successful and declined payments, card errors, disputes, and bank authentication. You can also test non-card payment methods and redirects.

fathom dragon Jun 9, 2025, 2:37 PM

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fiery anchor if unused, it expires after 12 hours?

If what is unused?

fiery anchor Jun 9, 2025, 2:37 PM

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confirmation token

fathom dragon Jun 9, 2025, 2:37 PM

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They have an expires_at field on the object that indicates when they expire:
https://docs.stripe.com/api/confirmation_tokens/object#confirmation_token_object-expires_at

fiery anchor Jun 9, 2025, 2:38 PM

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do this way of confirmation token is beter than client secret?

fathom dragon Jun 9, 2025, 2:43 PM

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I don't understand the question. Confirmation Tokens don't remove the need to use client secrets.

The guide my teammate shared shows them needing to be used together:

  const {error: confirmError} = await stripe.confirmPayment({
    clientSecret,
    confirmParams: {
      confirmation_token: confirmationToken.id
    },
  });```

fiery anchor Jun 9, 2025, 2:43 PM

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i am trying to create confirmation token, when using express checkout element , i see this

fathom dragon Jun 9, 2025, 2:44 PM

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Did you follow our guide?
The error message seems to indicate that you didn't mount the Express Checkout Element, or the Element you're intending to use to collect payment method details.

fiery anchor Jun 9, 2025, 2:46 PM

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ok thank can you leave this tikect opened for a while, maybe i will have another Q

fiery anchor Jun 9, 2025, 2:46 PM

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fathom dragon Did you follow our guide? The error message seems to indicate that you didn't mo...

express checkout has been mounted!!

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express checkout mounted and i still see the error

fathom dragon Jun 9, 2025, 2:48 PM

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Can you share your code?

fiery anchor Jun 9, 2025, 2:50 PM

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sec

fiery anchor Jun 9, 2025, 3:14 PM

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sorry for delay

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i have other Q

Frontend indicated the cost of $3.00, received a token. The backend when creating the payment intent and using this token specified $2.5. What will happen? I need a detailed answer

fathom dragon Jun 9, 2025, 3:15 PM

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Hang on, let's sort out the error message first.

fiery anchor Jun 9, 2025, 3:15 PM

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ok

fathom dragon Jun 9, 2025, 3:16 PM

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Do you see any errors being thrown when you call .mount()? Or is that completing as expected?

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What code is running inside of your CREATE_CONFIRMATION_TOKEN() function?

fiery anchor Jun 9, 2025, 3:18 PM

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fun, error is gone ahah
i think error was because of mode: 'setup'

fathom dragon Jun 9, 2025, 3:19 PM

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I doubt it, the Express Checkout Element supports using a mode of setup just fine.

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But glad to hear you're past that now.

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Frontend indicated the cost of $3.00, received a token. The backend when creating the payment intent and using this token specified $2.5. What will happen? I need a detailed answer
What do you see in your testing? If your backend tells us to process a payment of $2.50, we're going to process a payment of $2.50.

fiery anchor Jun 9, 2025, 3:20 PM

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fiery anchor i have other Q Frontend indicated the cost of $3.00, received a token. The back...

can you gice detailed answer for this?

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ok thx

fiery anchor Jun 9, 2025, 3:24 PM

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fathom dragon What code is running inside of your `CREATE_CONFIRMATION_TOKEN()` function?

fathom dragon Jun 9, 2025, 3:25 PM

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Sorry, I don't need that if you aren't seeing the error anymore. I didn't realize you'd already gotten past the previously mentioned error when I asked those questions.

fiery anchor Jun 9, 2025, 3:25 PM

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ok thank you for your help

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last Q

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the confirmation token works with mode of setup?

fathom dragon Jun 9, 2025, 3:29 PM

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Yes

fiery anchor Jun 9, 2025, 3:33 PM

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i see this error, when:

mode: 'setup'
if use both: .confirmSetup and token confirmation

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if disable .confirmSetup and keep only confirmation token + mode: 'setup' - all fine

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here fine

fathom dragon Jun 9, 2025, 3:35 PM

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You need to create the Confirmation Token first, the way we show in the guide

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Before confirming the intent, which should use the Confirmation Token you just created

fiery anchor Jun 9, 2025, 3:40 PM

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fathom dragon Before confirming the intent, which should use the Confirmation Token you just c...

this should done by backend?

fathom dragon Jun 9, 2025, 3:41 PM

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Nope, doesn't need to be.

fiery anchor Jun 9, 2025, 3:42 PM

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ok thank you so much

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i wish you good day

fathom dragon Jun 9, 2025, 3:43 PM

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Thanks, hope the same for you.

wheat treeBOT Jun 9, 2025, 3:45 PM

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#salim-bt_ece-errors