setup_future_usage can now return "off_session"

What changed

Producer-side tools call this additive. It breaks exhaustive switches, strict parsers and generated client enums.

Affects setup_future_usage on payment_method_options_twint reachable from 404 operations.

New value: off_session.

can now return "off_session"

Who is affected

Code that reads Stripe's payment_method_options_twint objects, used by 404 Stripe operations.

Before and after

Code that breaks

switch (response.setup_future_usage) {
  // existing branches …
  // no branch for "off_session"
  default:
    throw new Error("unexpected setup_future_usage");
}

Based on Stripe’s published API specification. How severity is decided.