hun_webhooks | Stripe Developers | Page 1

jade badgerBOT Dec 10, 2025, 4:03 PM

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wary oasis Dec 10, 2025, 4:04 PM

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You can create a checkout session in setup mode so that you can attach the 4000000000000341 (decline after attaching) card to the customer: https://docs.stripe.com/testing#declined-payments . Then set it as the default payment method on the customer and advance time

bleak violet Dec 10, 2025, 4:15 PM

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Two follow up questions:

Why setup mode? Should I be using a subscription mode instead of setup for live? I'm assuming using setup mode here is only intended for triggering the event after advancing the clock yes? There are some workflows that fires off internally, which is the reason why I've always just used the 4242 test card to run from start to finish, I'm not sure if setup mode is any different. Please correct me.
I don't see an option on the dashboard to attach an existing customer to a test clock. Where should I be looking?

wary oasis Dec 10, 2025, 4:17 PM

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You said it's for an existing subscription. Setup mode checkout sessions simply allow you to set up a payment method for future payments for a customer. https://docs.stripe.com/payments/save-and-reuse
You can't. You need to create the customer with a test clock: https://docs.stripe.com/billing/testing/test-clocks/api-advanced-usage?dashboard-or-api=api

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So really what you need to do here is create test clock and customer first

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Then pass the customer id to the checkout session creation request so it's used

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https://docs.stripe.com/api/checkout/sessions/create?api-version=2025-11-17.preview#create_checkout_session-customer

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So complete flow would look like:

#hun_webhooks