SMS API for E-commerce in India (2026) — Orders, Cart Recovery & OTP

SMS is the highest-reach communication channel for Indian e-commerce. With 95%+ open rates and near-instant delivery, it outperforms email for every time-sensitive touchpoint — order confirmation, delivery tracking, OTP verification, and flash sale alerts. An SMS API integrates directly into your order management, fulfilment, and CRM systems to automate all of these at scale. This guide explains each use case with code, benchmarks, and DLT requirements.

Why SMS Is Critical for Indian E-commerce

India's e-commerce market serves customers across urban and rural areas with widely varying internet reliability. SMS reaches every mobile number — smartphone or feature phone, 2G or 5G — without an app or internet connection. Key statistics:

• SMS open rate in India: 95–98%
• Average time to read: Under 3 minutes
• OTP delivery success rate via transactional SMS: 99%+
• Abandoned cart SMS recovery rate: 8–15% (first hour)
• Flash sale SMS CTR: 3–8% depending on offer relevance

E-commerce SMS Use Cases and API Implementation

1. Order Confirmation SMS

Triggered immediately when a customer places an order. Customers expect instant confirmation — delays erode trust.

DLT Template (register before use):

Dear {#var#}, your order {#var#} for {#var#} has been placed successfully. 
Estimated delivery: {#var#}. Track at example.com/track. — GCMDIA

Node.js Integration (triggered from order webhook):

// Called by your OMS/webhook when order status = "confirmed"
const sendOrderConfirmation = async (order) => {
  await fetch("https://api.getclickmedia.com/v1/sms/send", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "x-api-key": process.env.GCM_API_KEY,
    },
    body: JSON.stringify({
      to: `91${order.customerPhone}`,
      message: `Dear ${order.customerName}, your order ${order.orderId} for ${order.productName} has been placed successfully. Estimated delivery: ${order.deliveryDate}. Track at example.com/track. — GCMDIA`,
      senderId: "GCMDIA",
      templateId: process.env.ORDER_CONFIRM_TEMPLATE_ID,
      type: "transactional",
    }),
  });
};

---

2. Delivery Tracking Updates

Send status updates at each fulfilment milestone: shipped, out for delivery, delivered. Each milestone requires a separate DLT-approved template.

Shipped Template:

Your order {#var#} has been shipped via {#var#}. AWB: {#var#}. 
Track: {#var#}. — GCMDIA

Out for Delivery Template:

Your order {#var#} is out for delivery today. 
Delivery by {#var#}. — GCMDIA

Python — Milestone Dispatcher:

MILESTONE_TEMPLATES = {
    "shipped":          os.environ["SHIPPED_TEMPLATE_ID"],
    "out_for_delivery": os.environ["OFD_TEMPLATE_ID"],
    "delivered":        os.environ["DELIVERED_TEMPLATE_ID"],
}

def send_tracking_sms(order, milestone: str):
    template_id = MILESTONE_TEMPLATES[milestone]
    messages = {
        "shipped": (
            f"Your order {order['id']} has been shipped via {order['courier']}. "
            f"AWB: {order['awb']}. Track: example.com/track/{order['awb']}. — GCMDIA"
        ),
        "out_for_delivery": (
            f"Your order {order['id']} is out for delivery today. "
            f"Delivery by {order['eta']}. — GCMDIA"
        ),
        "delivered": (
            f"Your order {order['id']} has been delivered. "
            f"Rate your experience: example.com/review/{order['id']}. — GCMDIA"
        ),
    }

    requests.post(
        "https://api.getclickmedia.com/v1/sms/send",
        headers={"x-api-key": os.environ["GCM_API_KEY"]},
        json={
            "to": f"91{order['phone']}",
            "message": messages[milestone],
            "senderId": "GCMDIA",
            "templateId": template_id,
            "type": "transactional",
        },
    )

---

3. OTP Verification

OTP SMS is mandatory for account creation, checkout verification, and payment confirmation on most Indian e-commerce platforms.

DLT Template (transactional, DND-exempt):

{#var#} is your OTP for {#var#} on Example. 
Valid for 10 minutes. Do not share. — GCMDIA

OTP Generation and Delivery:

import { randomInt } from "crypto";
import bcrypt from "bcrypt";
import redis from "./redis";

export const sendOtp = async (phone) => {
  const otp = randomInt(100000, 999999).toString();

  // Store hashed OTP with 10-minute TTL
  const hash = await bcrypt.hash(otp, 10);
  await redis.set(`otp:${phone}`, hash, { EX: 600 });

  // Enforce 5 requests/hour rate limit
  const key = `otp_rate:${phone}`;
  const attempts = await redis.incr(key);
  if (attempts === 1) await redis.expire(key, 3600);
  if (attempts > 5) throw new Error("Rate limit exceeded. Try after 1 hour.");

  await fetch("https://api.getclickmedia.com/v1/sms/send", {
    method: "POST",
    headers: { "x-api-key": process.env.GCM_API_KEY, "Content-Type": "application/json" },
    body: JSON.stringify({
      to: `91${phone}`,
      message: `${otp} is your OTP for login on Example. Valid for 10 minutes. Do not share. — GCMDIA`,
      senderId: "GCMDIA",
      templateId: process.env.OTP_TEMPLATE_ID,
      type: "transactional",
    }),
  });

  return otp; // Return to store in session for verification
};

---

4. Abandoned Cart Recovery

Cart abandonment rates in India average 70–75%. SMS recovery campaigns sent within 1 hour achieve 8–15% recovery. A two-touch sequence (1 hour + 24 hours) improves this by 40%.

Recommended Sequence:

Message	Timing	Content
Message 1	1 hour post-abandonment	Reminder with cart link
Message 2	24 hours post-abandonment	Urgency + discount code

PHP — Cart Recovery Job:

function sendCartRecoverySms(array $cart, int $touchNumber): void {
    $templates = [
        1 => ["id" => $_ENV["CART_REMINDER_TEMPLATE_ID"], "message" =>
            "You left {$cart['product']} in your cart. Complete your purchase: example.com/cart/{$cart['id']}. — GCMDIA"],
        2 => ["id" => $_ENV["CART_DISCOUNT_TEMPLATE_ID"], "message" =>
            "Still thinking? Use code SAVE10 for 10% off your cart. Offer expires in 6 hrs: example.com/cart/{$cart['id']}. — GCMDIA"],
    ];

    $tmpl = $templates[$touchNumber];

    $ch = curl_init("https://api.getclickmedia.com/v1/sms/send");
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POST           => true,
        CURLOPT_HTTPHEADER     => ["Content-Type: application/json", "x-api-key: " . $_ENV["GCM_API_KEY"]],
        CURLOPT_POSTFIELDS     => json_encode([
            "to"         => "91" . $cart["phone"],
            "message"    => $tmpl["message"],
            "senderId"   => "GCMDIA",
            "templateId" => $tmpl["id"],
            "type"       => "promotional",
        ]),
    ]);
    curl_exec($ch);
    curl_close($ch);
}

---

5. Flash Sale and Promotional Campaigns

Bulk promotional SMS to segmented lists drives traffic spikes for sale events. Use the batch endpoint with scheduled dispatch for precise timing.

const launchFlashSaleSms = async (phoneNumbers, saleDetails) => {
  const response = await fetch("https://api.getclickmedia.com/v1/sms/bulk", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "x-api-key": process.env.GCM_API_KEY,
    },
    body: JSON.stringify({
      recipients: phoneNumbers,  // Array of "91XXXXXXXXXX" strings
      message: `${saleDetails.name} is LIVE! Up to ${saleDetails.discount}% off. Shop now: ${saleDetails.url} — GCMDIA`,
      senderId: "GCMDIA",
      templateId: process.env.FLASH_SALE_TEMPLATE_ID,
      type: "promotional",
      scheduleAt: saleDetails.startTime,  // ISO 8601: "2026-06-24T09:00:00+05:30"
    }),
  });

  const { batchId, queued } = await response.json();
  console.log(`Flash sale SMS queued: ${queued} recipients, batch: ${batchId}`);
};

Segmentation Tips for Better ROI:

• Target users who viewed the sale category in the past 30 days
• Exclude users who purchased in the past 7 days (reduces unsubscribes)
• Send 10–15 minutes before sale start for maximum traffic spike
• Track UTM parameters on the URL to measure SMS-attributed revenue

---

6. Return and Refund Notifications

Your return for order {#var#} has been approved. 
Refund of {#var#} will credit to your {#var#} in {#var#} working days. — GCMDIA

Automated refund notifications reduce support tickets by 30–40% and improve customer satisfaction scores.

DLT Template Summary for E-commerce

Use Case	Route	DND Exempt
Order confirmation	Transactional	Yes
Delivery tracking	Transactional	Yes
OTP verification	Transactional	Yes
Return/refund alert	Transactional	Yes
Abandoned cart	Promotional	No
Flash sale	Promotional	No
Loyalty rewards	Promotional	No

Measuring SMS Campaign Performance

Track these KPIs to optimise your SMS strategy:

KPI	Benchmark (India)
Transactional delivery rate	>98%
OTP delivery within 5 seconds	>99%
Promotional CTR	3–8%
Cart recovery rate (1-touch)	8–12%
Cart recovery rate (2-touch)	12–18%
Unsubscribe rate (promotional)	<0.5% healthy

Summary

An SMS API transforms every fulfilment event into a customer touchpoint — from the moment of purchase through delivery, return, and re-engagement. For Indian e-commerce, DLT-compliant transactional SMS is non-negotiable for OTPs and order alerts; promotional SMS drives campaign ROI when properly segmented. Get Click Media's SMS API handles both routes from a single integration with 99.9% uptime and sub-3-second transactional delivery.

Integrate SMS into your store today or view pricing.