For software vendors and IT teams
The SMS Meeting transactional API
Also called notification SMS, a transactional message is triggered by a specific event: an appointment confirmed, an order shipped, an access code issued. Our REST API lets your own software trigger it in a few lines.
14-day trial — 2 free SMS — no credit card
curl -X POST https://api.sms-meeting.com/v1/messages \
-H "Authorization: Bearer $SMSM_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"to": "+33612345678",
"sender": "CabinetX",
"body": "Reminder: appointment on 14/09 at 10:00, 45 Chancery Lane, London.",
"send_at": "2026-09-13T08:00:00Z"
}'201 Created
{
"id": "msg_01J9F4X7C2",
"status": "scheduled",
"send_at": "2026-09-13T08:00:00Z",
"segments": 1
}What the API does
An SMS channel wired into your system
Reminders and confirmations
Trigger appointment reminders, confirmations and follow-ups from your management software, ERP or patient portal, with the same reliability as our add-ins.
Service notifications
Deliveries, site visits, status updates, security codes: keep people informed in real time without tying up your teams.
Delivery receipts
Every message reports its delivery status. You know what arrived, what failed and why — useful for your reporting and your audits alike.
Transaction handling
Order confirmations, case updates, administrative milestones: a direct channel that builds trust and transparency.
Quick start
One HTTP call, one message on its way
API-key authentication, a JSON body, an immediate response carrying the message id. The public documentation covers statuses, delivery-receipt webhooks and scheduling.
Transactional SMS
A few concrete examples
Appointment reminder
Hello {firstname}, your appointment is confirmed for {date} at {time} — {place}. Reply STOP to opt out of reminders. {organisation}
Sample message
Order confirmation
Your order {number} is confirmed and will ship within 48 hours. Tracking is available in your account. {organisation}
Sample message
Delivery notification
Your parcel {number} will be delivered on {date}. Time slot and live tracking in your account. {organisation}
Sample message
Field service visit
Our engineer will visit on {date} between {time} and {time_end}. Please make sure access is available. {organisation}
Sample message
Frequently asked questions
You may be wondering…
What is a transactional SMS?
A text message tied to an action or a service: order confirmation, delivery notification, appointment reminder, verification code. It has no advertising purpose, so it can be sent whenever it is useful — unlike marketing messages.
When should I use the API rather than an add-in?
The Outlook or Google add-in is right whenever appointments are created in a calendar. The API takes over when appointments live inside business software: a hospital system, practice management software, an ERP, a citizen portal or an in-house CRM.
How much does the API cost?
API access is billed as a monthly call allowance, from €50 excl. VAT per month for 2,500 calls. Messages are still purchased separately in packs. See the Pricing page for details.
Does the API handle opt-outs?
Yes. STOP replies are reported back so your system can stop sending non-essential messages to that recipient.
Another question? Our team replies within one business day.
Try SMS Meeting
See for yourself what SMS does to your no-show rate. 14-day trial, 2 free messages, no subscription and no payment details required.
14-day trial — 2 free SMS — no credit card