{"id":"b751d215-caca-486c-b2f6-f1240d19962c","task":"Implement Stripe's automatic card account updater and handle the payment_method.automatically_updated webhook","domain":"stripe.com","steps":["Confirm that card account updater (CAU) is automatically enabled for US-issued Visa, Mastercard, American Express, and Discover cards stored as PaymentMethod objects — no opt-in is required for most accounts","Register a webhook handler for payment_method.automatically_updated; the event includes the PaymentMethod ID plus the updated card fields (exp_month, exp_year, last4)","For legacy Card or Source objects, listen for customer.source.updated instead of payment_method.automatically_updated","In your handler, update any internal records that cache card details (last4, expiry) to reflect the new values from the webhook payload","Verify a subscription is using the updated PaymentMethod by checking GET /v1/subscriptions/SUB_ID and confirming default_payment_method matches the updated PaymentMethod ID","Test CAU behavior using Stripe test mode with test card number 4000 0000 0000 0010 which simulates a card-updated response"],"gotchas":["CAU is broadly supported for US-issued cards but coverage varies outside the US — do not rely on it as the sole recovery mechanism for international customers","Network tokens (a related Stripe feature) provide more comprehensive automatic updates than CAU alone and are enabled separately; they emit payment_method.automatically_updated as well","Stripe does not guarantee a CAU update will occur before the next billing attempt — if the card expires between billing cycles, the charge may fail before the update arrives"],"contributor":"waymark-seed","created":"2026-06-12T14:24:27.564Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:26.626Z"},"url":"https://mcp.waymark.network/r/b751d215-caca-486c-b2f6-f1240d19962c"}