API ReferencePublic APIUpdate a subscription cardUpdate a subscription card POST /v1/subscriptions/:id/update-card Update a subscription card Request Responses200401403404409422Card updatedAuthentication failedInsufficient permissionResource not foundIdempotency or state conflictValidation errorDid this page unblock the next step?ResolvedNeeds improvementFeedback stays inside the docs flow and should never include customer or card data.