Delivery Receipts

Delivery receipts provide a mechanism to track the status of messages sent through the API. When you send a message with a receiptRequest, the system will send a delivery receipt to your specified callback URL once the message reaches its final state. This allows you to monitor the delivery status of your messages in real-time.

Delivery receipts are sent to the callback URL specified in the receiptRequest object of the message request. If you do not include a receiptRequest, no delivery receipt will be sent.

Ensure that the callback URL is publicly accessible and can handle incoming HTTP POST requests to receive the delivery receipts.

Delivery Receipt Format

A delivery receipt is sent as an HTTP POST request to your callback URL with the following JSON structure:

{
  "type": "SmsDeliveryReceipt",
  "correlator": "8f24c8c6-7e7c-4b6f-a622-d4a25f91d3c1",
  "phone": "+254123456789",
  "timestamp": "2025-06-02T14:30:00Z",
  "deliveryStatus": "Delivered"
}

Fields Explanation

Field	Type	Description
`type`	String	Type of the request, which is always `SmsDeliveryReceipt` for SMS delivery receipts
`correlator`	String	Unique ID that correlates with your original message request
`phone`	String	Recipient’s phone number
`timestamp`	String	ISO-8601 formatted date and time when the delivery status was recorded
`deliveryStatus`	String	Current delivery status of the message
`reason`	String	Optional human-readable explanation for the delivery status
`reasonCode`	String	Optional provider-specific code related to the delivery status

Possible Delivery Status Values

Status	Description
`Waiting`	Delivery process is pending and hasn’t been attempted yet
`Delivered`	Message was successfully delivered to the recipient
`DeliveryUncertain`	Delivery status is ambiguous or unknown
`DeliveryImpossible`	Delivery failed and was deemed impossible
`SenderBlacklisted`	Sender is blacklisted, preventing delivery
`InsufficientFunds`	Delivery failed due to insufficient account credits
`InvalidLinkId`	The provided link ID for delivery was invalid
`SubscriberOptedOut`	Recipient has opted out and cannot receive messages
`AbsentSubscriber`	Recipient is temporarily unavailable or unreachable
`InvalidMsisdn`	Recipient’s phone number is invalid
`Failed`	Termination failed while attempting to handover to gateway

Receipt Request

An optional object on send requests that enables delivery status callbacks. It must be included in the SMS message request body when sending a message to receive delivery receipts for that message.

{
  "correlator": "12345678-1234-5678-1234-567812345678",
  "callbackUrl": "https://acme.org/sms/delivery-reports"
}

Receipt Request

An optional object on send requests that enables delivery status callbacks. It must be included in the SMS message request body when sending a message to receive delivery receipts for that message.

{
  "correlator": "12345678-1234-5678-1234-567812345678",
  "callbackUrl": "https://acme.org/sms/delivery-reports"
}

Field	Type	Constraints
correlator	string	Non-empty, maximum 100 characters. Used to correlate callbacks to the originating request (we recommend `UUID`).
callbackUrl	string	Valid `https://` or `http://` URL. The endpoint must not require authentication

When provided, both fields are required. An invalid receiptRequest causes the entire request to be rejected with 400 Bad Request before any messages are dispatched.

REST API

Authentication

Services

Messaging

USSD

Mobile Data

Bundles

Campaigns

Delivery Receipt Format

Fields Explanation

Possible Delivery Status Values

Receipt Request

Receipt Request

​Delivery Receipt Format

​Fields Explanation

​Possible Delivery Status Values

​Receipt Request

​Receipt Request

Delivery Receipt Format

Fields Explanation

Possible Delivery Status Values

Receipt Request

Receipt Request