Send a message

One message to one recipient — the workhorse for OTPs, alerts and confirmations.

POSThttps://api.mobilesasa.com/v1/send/message

Parameters

Field	Type	Required	Description
senderID	string	Yes	An approved sender ID on your account (case-sensitive).
phone	string	Yes	The recipient. `07…`, `2547…` and `+2547…` formats all accepted.
message	string	Yes	The text. Long messages are split into parts automatically (billed per part).

curl -X POST https://api.mobilesasa.com/v1/send/message \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "senderID": "MOBILESASA",
    "phone": "0712345678",
    "message": "Your verification code is 482913. Valid for 10 minutes."
  }'

Response

200 — accepted

{
  "status": true,
  "responseCode": "0200",
  "message": "Accepted for delivery"
}

Validation failure

{
  "status": false,
  "responseCode": "0422",
  "message": "phone is not a valid Kenyan number"
}

GET variant — for ERPs and legacy systems

GEThttps://api.mobilesasa.com/v1/send/messageget

Many ERPs, accounting packages and older systems can only fire a plain URL — no request body, sometimes not even a header. This endpoint accepts the exact same fields as the POST, but as query-string parameters, with the token passed as api_token:

The whole integration is one URL

https://api.mobilesasa.com/v1/send/messageget?api_token=YOUR_API_TOKEN&senderID=MOBILESASA&phone=0712345678&message=Invoice+INV-2041+of+KES+12%2C400+is+ready.

curl

curl -G "https://api.mobilesasa.com/v1/send/messageget" \
  --data-urlencode "api_token=YOUR_API_TOKEN" \
  --data-urlencode "senderID=MOBILESASA" \
  --data-urlencode "phone=0712345678" \
  --data-urlencode "message=Invoice INV-2041 of KES 12,400 is ready."

The response envelope is identical to the POST. If your system can set headers, Authorization: Bearer still works here and is preferred over api_token in the URL.

URL-encode the message

Spaces, commas, ampersands and non-ASCII characters must be percent-encoded or the message will be truncated at the first special character. Every language above has a URL-encoding helper — use it (curl's is --data-urlencode). Also remember URLs (query string included) end up in proxy and server logs; keep GET sends for systems that genuinely cannot POST.

Things worth knowing

Accepted ≠ delivered. 0200 means queued with the carrier. Confirm delivery via delivery reports.
Duplicates are blocked (0409) — the same sender + text + number delivers at most once per day, unless the sender allows repeats. See Responses.
Balance is checked first. An 0402 response bills nothing.
Need your own reference on the send, or the cost back? Use v2.

OTP senders

Register a dedicated transactional sender for OTPs and enable duplicate sends on it — verification codes legitimately repeat, and transactional traffic rides the priority lane.