SMS API Integration Guide: Send Your First Message in Minutes

An SMS API lets your application send messages programmatically instead of logging into a dashboard. The mechanics are simple: you POST a JSON payload to an endpoint with an API key, and the provider does the carrier work. This guide walks through the whole integration.

What you need before you start

• An account on the messaging platform (register, then generate an API key).
• A verified sender ID or your phone number for testing.
• Wallet credits — the send is billed to your prepaid balance.

1. Authenticate with your API key

Most SMS APIs use a header-based key. With Aion Messaging you include it on every request:

X-API-Key: sk_live_xxxxxxxxxxxxxx

Keep the key server-side. Never embed it in browser JavaScript or public mobile apps.

2. Send a single SMS

A minimal request looks like this (cURL):

curl -X POST https://aionmessaging.com/api/v1/sms/send \
  -H "X-API-Key: sk_live_xxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+233545629414",
    "sender_id": "MYBRAND",
    "message": "Your OTP is 483921",
    "priority": true
  }'

The response returns a message ID. Hold on to it — you use it to match delivery reports later.

3. Handle delivery reports (DLR)

Delivery is asynchronous. Configure a webhook URL and the platform POSTs status updates (submitted, delivered, failed) to it. Verify the payload is genuinely from the provider before trusting it, then update your database so your UI shows the true state.

4. Bulk sends and scheduling

For campaigns, use the bulk endpoint or the dashboard. Deduplicate numbers, scrub invalid ones, and respect opt-outs — providers and regulators enforce this, and it protects your sender reputation.

Common integration mistakes

• Treating HTTP 200 as "delivered" — it means accepted, not delivered.
• Ignoring timezones when scheduling international sends.
• Sending the same OTP twice with no expiry and no retry limit.

Full endpoint reference, code examples and webhook payloads live in the API documentation.