Response field preferred_settlement_speed removed

What changed

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

Affects payment_intent_payment_method_options_us_bank_account reachable from 405 operations.

Who is affected

Code that reads Stripe's payment_intent_payment_method_options_us_bank_account objects, used by 405 Stripe operations.

Before and after

Code that breaks

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

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