Webhooks

Inbound endpoint Nomba calls; documented for completeness, not called by integrators.

📄️Internal endpoint Nomba calls into. Not used by Kobo integrators.

Documented for completeness and for engineers implementing the reconciliation engine. Verifies the Nomba signature header before processing. Every event includes a transaction reference used as the idempotency key; duplicate deliveries are accepted (200) but produce no additional ledger writes.