SMS API Service in Coimbatore

Quick Start — Send Your First SMS

curl -X POST https://api.onlinesmsservice.com/v1/send \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "919876543210",
    "message": "Hello from Coimbatore! Your OTP is 123456",
    "sender": "OTPSMS",
    "type": "transactional"
  }'

See full documentation: API Integration Guide

Going to Production: What Coimbatore Dev Teams Should Plan For

Sending your first test SMS takes five minutes; running reliably at volume takes a little planning. Based on integrations we've supported for SaaS teams at TIDEL Park and product companies across Coimbatore, budget for these four items:

• DLT mapping in code: every message must carry an approved template ID and registered sender ID. Keep a template map in config — not hardcoded strings — so marketing can add templates without a deploy. We assist with DLT registration and template approval before you write a line of code.
• Delivery webhooks over polling: register a callback URL and persist DLR statuses (DELIVRD, UNDELIV, EXPIRED, REJECTD) against your message IDs. Rejections almost always mean a template mismatch — alert on them.
• Retry with idempotency: network timeouts happen; retry with exponential backoff and pass your own unique message reference so a retry never double-sends an OTP.
• Sandbox first: test against the sandbox with virtual numbers so QA runs don't consume credits or hit real customers.

Full endpoint reference, SDKs, and webhook payload formats are in the developer API documentation. Prefer a working example? Our team in Coimbatore can pair with your developers over a call — most integrations go live the same week.

SMS API FAQ