Use a Stripe sandbox, not a live customer, to inspect customer portal changes before release. In the Dashboard, choose a representative sandbox customer and open Actions > Open customer portal. For an invoicing-management preview, Stripe’s documented workflow also requires creating a new invoice for that customer. Then test the customer journeys affected by your change and verify that your integration selects the intended portal configuration.
What the sandbox preview does—and does not—show
Stripe describes a sandbox as an isolated environment: “Nothing you do in a sandbox affects your live setup.” Its documented portal preview is a Dashboard workflow for inspecting the experience in a customer’s context. A live-mode customer is not a substitute: Stripe says the customer quick view used for this workflow is unavailable for live-mode customers. See Stripe’s customer portal configuration guide.
The guide gives specific steps for previewing invoicing management; it does not describe a separate visual-preview button for every portal setting. Use the customer view to inspect the affected experience, and exercise each changed path with suitable sandbox data to check its outcome.
Preview a portal for a sandbox customer
- Switch to a Stripe sandbox. Make and inspect the change in the isolated test environment rather than changing live settings as a preview.
- Choose a representative test customer. Match the record to the behavior you need to inspect. For example, a subscription change needs a customer with a relevant subscription; invoice-related behavior needs suitable invoice data.
- Create an invoice when previewing invoicing management. Stripe’s documented invoicing-management preview specifically directs you to create a new invoice for the customer.
- Open the portal. Go to the customer’s page, open the overflow menu, and select Actions > Open customer portal.
- Follow the changed customer journey. Check the displayed choices and complete the relevant flow using sandbox data. Inspect the resulting behavior, not just whether the setting saved.
Check the behaviors your change affects
Portal settings determine which customer actions and information are available. Review the relevant items below; do not assume a setting’s label alone tells you how it will appear or what billing outcome it produces.
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- Subscription changes: Verify enabled plan switching and quantity changes. Check prorations and any scheduled, end-of-period downgrade behavior against your configured rules; an update does not necessarily take effect immediately.
- Cancellation: Confirm the available cancellation timing and whether the flow collects a reason, if enabled.
- Billing details and payment methods: Check which billing information customers may change and whether payment-method management behaves as intended.
- Invoices: Confirm invoice-history visibility and, for an invoicing-management preview, inspect the customer with the new invoice in place.
- Promotion codes: If enabled, test the promotion-code path with appropriate sandbox data.
- Presentation and exit behavior: Check branding, business details, and the redirect destination after the portal flow.
Stripe documents these options in its Dashboard configuration guide and portal configuration API reference.
Verify the configuration your integration opens
A successful Dashboard preview does not by itself establish that your application opens the same portal configuration. When creating a portal session, the integration supplies the customer and a return URL, and it can supply a configuration ID. Stripe uses the default configuration if that ID is omitted. Review the session-creation path to make sure your test uses the configuration you intend to release.
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The portal session API reference documents the optional configuration selection, customer context, return URL, and session mode field. The configuration API reference and session reference expose a livemode field. For a pre-release check, use sandbox/test resources and verify that the resources involved are in the intended environment.
Use a release check that matches the change
Before releasing a portal change, test the relevant combination of configuration, customer state, and journey. A representative record matters: a cancellation test does not validate subscription updates, and an invoice-history check does not establish that payment-method editing works. Where a flow affects billing timing or redirects, confirm the actual displayed and resulting behavior in the sandbox rather than inferring it from the saved setting.
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- Record the configuration ID the application session should use, or confirm that relying on the default is intentional.
- Use customer data that exercises the changed feature, including a subscription or invoice where needed.
- Complete each changed customer-facing path and check its outcome.
- Keep this inspection in sandbox/test mode; do not use a live customer quick view as the preview.
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