API Documentation — Relayno

REST API

Quickstart

Send your first WhatsApp message programmatically in under 5 minutes. All you need is an API key and a connected WhatsApp session.

Base URL

https://api.relayno.com

All endpoints are HTTPS-only. HTTP requests are rejected with 400.

Prerequisites

Go to Settings → API Keys and click Create key.

Copy the key — it starts with mk_live_ and is shown only once.

Connect at least one WhatsApp session (Settings → WhatsApp).

Paste your key below and run the request.

Send your first message

curl -X POST https://api.relayno.com/v1/messages/send \
  -H "Authorization: Bearer mk_live_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "212600000000", "message": "Hello from Relayno!"}'

Response

HTTP/1.1 200 OK
Content-Type: application/json

{
  "id": "msg_a1b2c3d4e5f6",
  "waMessageId": "wamid.HBgNMjEyNjAwMDAwMDAwFQIAERgSOUJDNzM0RjI1RjY4RjI3RDAA",
  "status": "sent"
}

idstring

Internal Relayno message ID.

waMessageIdstring

WhatsApp message ID returned by Meta — use this for delivery tracking.

statusstring

"sent" | "failed". Delivery receipts arrive later via webhook.

Next steps

Authentication →

Key rotation, scopes, and error handling.

Send Message →

Images, documents, audio, and video.

Webhook Events →

Receive delivery receipts and incoming messages.

Relayno — the all-in-one business platform · Stock · HMS · WhatsApp · Invoices · Emails

Relayno

Pricing

Operations

Stock

Track inventory, warehouses and stock movements in real time.

Invoices

Quotes, invoices, payments and tax — all handled.

Communication

Shared team inbox, campaigns and the official WhatsApp API.

Emails

Send, automate and track transactional and marketing email.

Hospitality

HMS

Hotel management: reservations, front desk, housekeeping, channel manager and billing.

WordPress Plugins

WhatsApp for WordPress

Add a WhatsApp chat button, shared inbox and the official API to any WordPress site.

WooCommerce ↔ Relayno Stock

Soon

Sync WooCommerce products, orders and inventory with the Relayno stock app in real time.

Reservations for WordPress

Soon

Let visitors book appointments and tables right from your WordPress pages.

Social

Facebook Auto-Posting

Soon

Schedule and auto-publish your products and updates to Facebook.

Instagram Auto-Posting

Soon

Schedule and auto-publish your products and updates to Instagram.

ERP

Odoo Stock Management

Soon

Two-way sync of inventory and stock movements with your Odoo instance.

REST APIs

WhatsApp API

Send messages, receive webhooks, manage sessions.

Stock API

Soon

Inventory and stock management REST API.

HMS API

Soon

Hotel management REST API.

How to use

How to use our apps

Step-by-step guides for every Relayno product.

Company

About

Relayno started as a WhatsApp gateway for one shop. It grew into the platform that shop wished existed.

Careers

Small team, real users, short feedback loop. If you want your work in production this month, this is that kind of place.

Contact

Pick the route that matches what you need — they go to different people.

REST API

Quickstart

Send your first WhatsApp message programmatically in under 5 minutes. All you need is an API key and a connected WhatsApp session.

Base URL

https://api.relayno.com

All endpoints are HTTPS-only. HTTP requests are rejected with 400.

Prerequisites

Go to Settings → API Keys and click Create key.

Copy the key — it starts with mk_live_ and is shown only once.

Connect at least one WhatsApp session (Settings → WhatsApp).

Paste your key below and run the request.

Send your first message

curl -X POST https://api.relayno.com/v1/messages/send \
  -H "Authorization: Bearer mk_live_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "212600000000", "message": "Hello from Relayno!"}'

Response

HTTP/1.1 200 OK
Content-Type: application/json

{
  "id": "msg_a1b2c3d4e5f6",
  "waMessageId": "wamid.HBgNMjEyNjAwMDAwMDAwFQIAERgSOUJDNzM0RjI1RjY4RjI3RDAA",
  "status": "sent"
}

idstring

Internal Relayno message ID.

waMessageIdstring

WhatsApp message ID returned by Meta — use this for delivery tracking.

statusstring

"sent" | "failed". Delivery receipts arrive later via webhook.

Next steps

Authentication →

Key rotation, scopes, and error handling.

Send Message →

Images, documents, audio, and video.

Webhook Events →

Receive delivery receipts and incoming messages.

Relayno

The all-in-one business platform. Run every team and module from a single login.

Modules

Stock HMS WhatsApp Invoices Emails

Company

About Careers Contact Privacy Terms

Resources

Docs Blog Status Support