Direction: Inbound (QI Tech / payment infrastructure → BNPL WL). Partners do not call this endpoint directly.

Webhook endpoint for receiving invoice (fatura) status change notifications. This is triggered when an invoice transitions between states.

Common status transitions:

• OPEN -> PAID: Invoice fully paid
• OPEN -> CLOSED: Invoice closed — all items settled or cancelled
• OPEN -> OVERDUE_GRACE: Invoice past due date (no fines yet, normal limit maintained)
• OVERDUE_GRACE -> OVERDUE_PENALTY: Grace period expired, fines and interest now apply
• OVERDUE_GRACE -> PAID: Payment received during grace period (no fines)
• OVERDUE_PENALTY -> PAID: Late payment received (with fines)