An archetypal commerce company — 340k saved cards, 60k active subscriptions — is moving from Adyen to Stripe. You're the migration lead. Work the checklist, open the gates, and when the fork comes, choose your cutover. The core lesson is asymmetry: a routing flag rolls back in seconds, but a subscription that renewed on the wrong provider cannot be un-renewed — and refunds chase the original provider for months after you're "done."
Progress saves in this browser only. Nothing here describes any particular company — it's the shape every card-on-file migration has. (Cards only: direct-debit rails like SEPA carry mandates, which migrate differently.)
One HTML file, no frameworks, no trackers. Vendor processes change — verify the specifics with your providers before betting production on them. · more fun pages ·