Airwallex cancel_url is silently ignored: use back_url or failUrl
When your Airwallex checkout never returns the shopper to the right place on cancel, check the parameter name: cancel_url is not a real Airwallex parameter and gets ignored without an error. Pass back_url for Billing Checkout, or failUrl and successUrl for the Hosted Payment Page. And regenerate checkout links older than an hour; they expire silently.
Context: Airwallex's official billing checkout skill reference: no Airwallex API accepts a cancel_url parameter, so it is silently ignored. Billing Checkout expects back_url; the Hosted Payment Page expects failUrl and successUrl. The same troubleshooting table notes that checkout URLs expire after one hour and must be recreated, and that webhook signature failures are usually fixed by reading the raw body (express.raw) before parsing.Maintainer review
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