Conexteo API - Developer documentation

Welcome to the official documentation of the Conexteo API, the French SMS and RCS
messaging platform for businesses.

Base URL

All API endpoints are served from:

https://api.conexteo.com

Create your account on app.conexteo.com

Retrieve your API key from My Account / API / Webhook

Authenticate your calls with the following header:

X-API-Key: your-api-key

Send your first message via the Messages / SMS or Messages / RCS section
in the left sidebar.

Capability	Details
Marketing and transactional SMS	Single-recipient, contact-list, file-based, or scheduled sends
RCS (Rich Communication Services)	Rich messages with cards, carousels, interactive buttons, and automatic SMS fallback
Contact management	Contact lists and dynamic contacts with up to 10 custom fields
Stop management	Opt-outs and GDPR compliance
Sub-accounts	Multi-user administration with credit management

The Conexteo API uses API-key authentication. Add the X-API-Key header to every
request.

For advanced operations (sub-account management), a JWT token is required. See the
auth section in the sidebar.

To prevent duplicate sends, supply the external_id field (a client-side unique
identifier) in your message creation payloads.

If a message has already been submitted with the same external_id for your account,
the API responds with HTTP 409 Conflict:

{
  "status": 409,
  "error": "External ID already processed"
}

Your integration must treat this status as confirmation that the send was already
processed, and must not retry the request.