payto is no longer accepted

What changed

Usually ignored rather than rejected, so the call succeeds and does something subtly different.

Affects payto on POST /v1/payment_methods/{payment_method}. Grep for it: nothing else will tell you.

Who is affected

Code that sends POST /v1/payment_methods/{payment_method} (payto).

Before and after

Code that breaks

await client.post("/v1/payment_methods/{payment_method}", {
  // payto is now ignored, not rejected
  payto: value,
});

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