- prepayment as DISCOUNT: live API rejects PRE_PAYMENT with 400 third_party.generic - normalize lowercase ETTN statuses returned by the live API - show Checkbox error code instead of bare 'Internal Server Error' - page size 50 for ETTN list, 429 rate limit is retryable, pause polling on it - phone in 380XXXXXXXXX format like portal receipts Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>