| HTTP Code | Status | Description & Action |
|---|---|---|
| 200 OK | Dispatched | Message accepted by gateway and queued/dispatched via designated WhatsApp channel. |
| 400 Bad Request | Validation Failed | Missing recipient phone number, empty message content, or invalid JSON syntax. |
| 401 Unauthorized | Missing Token | Missing Bearer token in the Authorization request header. |
| 403 Forbidden | Invalid Key / Suspended | API Key revoked or account has been suspended by the administrator. |
| 428 Precondition | Meta Not Configured | Attempted to send via channel: official but no verified WABA token is linked. |
| 429 Rate Limit | Quota Exhausted | Monthly plan request quota reached. Upgrade plan or contact admin for quota top-up. |
| 502 Bad Gateway | Gateway Offline | Device gateway service is temporarily unavailable or unreachable. |