Response field iin removed

What changed

Reads of this field return undefined, and the failure surfaces wherever that value is used rather than at the call.

Affects card reachable from 572 operations.

Who is affected

Code that reads Stripe's card objects, used by 572 Stripe operations.

Before and after

Code that breaks

// response.iin is now undefined
const iin = response.iin;

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