Messaging for E-commerce in India | SMS, WhatsApp, Email

FILE 01 / WHERE E-COMMERCE MESSAGING BREAKS

OTPs miss the moment. COD orders stay unconfirmed. Cart recovery sits in Meta review hell.

Every Indian D2C brand hits the same five failure points as they scale past 500 orders a day. Delivery OTPs miss the 15-second window at the doorstep and the courier marks the parcel undelivered. Fake COD orders sit in an unconfirmed queue because nobody built the confirmation IVR. Refund updates never reach the buyer so support handles the same "where is my money" ticket 200 times a week.

Then the sale day arrives. Big Billion Days, Republic Day, or an influencer drop pushes traffic to 40x normal. Your single SMS vendor throttles at 100 TPS. Half the order-shipped notifications get delayed by 4 hours. WhatsApp marketing templates get rejected because the template category was set wrong at submission. Someone in ops is manually re-sending failed OTPs from a spreadsheet at 2 AM.

Cart abandonment is the third quiet killer. Most brands set up a Klaviyo flow, get a few WhatsApp templates approved, run it for a month, then lose momentum because nobody owns the numbers. A properly instrumented cart recovery sequence on WhatsApp + email + SMS recovers 8 to 14 percent of abandoned carts. Left unattended, that number sits at 1 to 3 percent.

PROOF OF WORK

We run BookMySMS, our own bulk SMS + WhatsApp gateway

BookMySMS handles transactional and promotional traffic for brands running on Shopify, WooCommerce, Magento and custom OMS. We know the failure modes of Twilio, MSG91, Gupshup, Kaleyra and WhatsApp Business API because we route around them every day. Managed messaging for your store is the same playbook we already run for ourselves.

See BookMySMS

FILE 02 / WHAT WE BUILD

Six messaging flows every Indian D2C brand needs live

FLOW-01 · Under 30s from event

Order Confirmation + Status

Placed, packed, shipped, out for delivery, delivered. SMS + WhatsApp with tracking link, courier partner, AWB number. Dedup logic suppresses SMS if WhatsApp was read within 10 minutes.

FLOW-02 · 25-40% fake orders cut

COD Confirmation IVR

Auto-dial every COD buyer within 60 seconds. DTMF confirmation (press 1 to confirm). Unconfirmed orders retry twice, then flag for cancellation. WhatsApp fallback with tap-to-confirm button.

FLOW-03 · 8-14% cart recovery

Cart Abandonment Recovery

WhatsApp marketing template at 1 hour (soft nudge), 24 hours (discount code), 72 hours (final offer). Email backup for opted-out numbers. Coupon codes single-use, tied to session ID. Handoff to CS if high-cart-value.

FLOW-04 · 40-60% fewer tickets

Refund + Return Status

Every refund state change (initiated, approved, processed by gateway, credited) triggers a WhatsApp message with exact amount, reference ID and expected credit date. Payment gateway webhooks wired for Razorpay, Cashfree, Paytm, PhonePe.

FLOW-05 · 99.4%+ delivery rate

Delivery OTP API

6-digit OTP at delivery attempt, 10-minute expiry, single-use. Primary SMS route with 15-second timeout, then WhatsApp fallback, then voice OTP for weak-signal pincodes. Delivery status back to courier API.

FLOW-06 · Held 99.4% at 8x peak

Sale Campaign Delivery

Big Billion / Republic Day / Diwali prep. Two pre-warmed SMS vendors, redundant BSP for WhatsApp, throttle plans, live delivery dashboard for the 72-hour peak. Segment-aware send times.

Sale season coming up? Do not wait until week two.

15-min call. Tell us your current SMS + WhatsApp setup, order volume, and next sale date. We come back with a pre-warming plan and vendor failover architecture in 48 hours.

Chat with Deci

FILE 03 / TECH STACK WE USE

Vendors we route around every day

No single vendor owns the pipe. Every flow has a primary and a secondary route, chosen by cost per message, delivery latency in the destination pincode, and current provider health.

STACK-01

SMS Providers

MSG91 · Kaleyra · Karix · Twilio · BookMySMS

STACK-02

WhatsApp Business API

Gupshup BSP · Kaleyra WhatsApp · Meta Cloud API · Interakt

STACK-03

Email Delivery

Amazon SES · SendGrid · Postmark · Brevo

STACK-04

Voice + IVR

Exotel · Knowlarity · Plivo · Twilio Voice

STACK-05

E-commerce Platforms

Shopify · WooCommerce · Magento · Unicommerce · Shiprocket

STACK-06

Observability

Grafana dashboards · Delivery report API · PagerDuty alerts · Weekly ops digest

FILE 04 / COMPLIANCE & DELIVERY GUARANTEES

DLT, DND, opt-out, DPDP handled for you

Indian e-commerce lives inside TRAI DLT rules. Every SMS you send needs a registered Principal Entity, an approved Header (like FLIPKT or MEESHO), and pre-approved templates for each message type. Miss a template registration and delivery drops to 0 within 24 hours on the operator side. We handle the PE registration on Jio TrueConnect, header approvals, and template lifecycle including retries when Jio rejects for missing variables.

DND compliance is baked in. Transactional messages (order status, OTP, refund) go to all numbers including DND. Promotional messages (sale, cart recovery) respect DND lists and honour opt-out keywords (STOP, UNSUB) automatically. WhatsApp opt-out is one tap and synced to your CDP so a user who opts out on WhatsApp does not receive SMS marketing either.

DPDP Act obligations (India's data protection law) are covered. Consent capture at signup and checkout, purpose limitation for message data, breach notification wiring, right-to-erasure for message history when a user deletes their account. If you handle EU shoppers we also cover GDPR consent basis for messaging.

Compliance checklist per go-live ● WHAT WE COVER

✓ DLT PE registration on Jio TrueConnect + Airtel + VI + BSNL
✓ Header approval for transactional and promotional
✓ Template registration for every message variant
✓ DND scrubbing for all promotional sends
✓ Opt-out sync across SMS + WhatsApp + email
✓ DPDP consent capture and audit trail
✓ 99.9% SLA on transactional delivery

FILE 05 / PRICING

Setup + monthly ops + campaign bursts

ONE-TIME

Setup & Onboarding

DLT PE, header, template approvals for the full order flow. Vendor account setup, webhook wiring into OMS, first go-live.

₹1.25 L

MONTHLY

Managed Delivery Ops

Vendor failover, WhatsApp BSP monitoring, template hygiene, opt-out sync, weekly delivery report, on-call for OTP outages.

From ₹55k/mo

PER CAMPAIGN

Sale Campaign Bundle

72-hour peak prep. Pre-warmed sender IDs, redundant BSP, throttle plans, live delivery dashboard, on-site engineer for D-day.

₹45k

SPECIALTY

COD Confirmation IVR

Auto-dial IVR + WhatsApp confirmation + retry logic. Setup plus 3 months of tuning included.

₹1.85 L

Per-message costs (pass-through, at our BookMySMS wholesale rates): SMS transactional ₹0.15-0.22 / SMS promotional ₹0.18-0.28 / WhatsApp utility ₹0.35-0.50 / WhatsApp marketing ₹0.65-0.85 / voice IVR ₹0.60-0.90 per 30 seconds.

This page covers e-commerce specifics. For the full service — channels, gateway management, AI monitoring and how engagements run — see Messaging & Notification Systems →

REF-A Parent & Related

REF-B Messaging by Industry

REF-C Product & Proof

FILE 06 / FIELD MANUAL — FAQ

Questions D2C founders ask on the first call

Do we need DLT registration for order update SMS?

Yes. Every promotional and transactional SMS sent to Indian mobile numbers must go through DLT (Distributed Ledger Technology) registration with one of the operator platforms (Jio, Airtel, VI, BSNL). You register a Principal Entity, a Header (sender ID like ABCSHP) and each template you plan to send. Order confirmation, out-for-delivery, delivered, OTP, refund initiated are all separate template registrations. We handle the paperwork, PE registration, header approval and template submission end to end.

Which is better for order updates, SMS or WhatsApp?

Use both. SMS still lands on every Indian phone including feature phones and users on low-connectivity plans. WhatsApp gets 3-5x higher open rates and lets you attach the tracking link, image of the product and a reply button for support. Our default architecture sends the same event to both channels with smart deduplication (if WhatsApp is delivered and read within 10 minutes, we suppress the SMS to save cost). WhatsApp costs more per message but the read and click-through rates justify it for shipped, out-for-delivery, and delivered events.

How do you reduce fake COD orders?

Two levers. First, an automated IVR that dials the buyer within 60 seconds of order placement, asks them to press 1 to confirm, and marks unconfirmed orders as pending. Second, a WhatsApp confirmation flow with a tap-to-confirm button, plus a 6-hour reminder if unresponded. Together these cut cancelled COD orders by 25 to 40 percent for most catalogs. For high-ticket items we add a callback from your CS team as a third layer.

What delivery OTP setup do you recommend?

Six-digit numeric OTP generated at delivery attempt, sent over SMS on the primary DLT header, plus WhatsApp as backup. 10-minute expiry, single-use, invalidated after successful scan. If the SMS does not deliver in 15 seconds, we auto-failover to the secondary vendor. For zones with poor SMS delivery (parts of the North-East, some rural pincodes) we default to WhatsApp first and voice OTP as fallback. Full delivery status flows back to your delivery partner API.

Can you run cart abandonment on WhatsApp legally?

Yes, with proper opt-in. WhatsApp Business API allows marketing template messages to users who have opted in through a checkbox at checkout or account creation. Cart abandonment sequences use approved marketing templates (image + product name + discount code + CTA button). We stage the sequence: 1 hour after abandonment (soft nudge), 24 hours (10 percent discount code), 72 hours (final offer). Opt-out is one tap and honoured across all future sends. Meta charges per marketing template message which we optimise by segment.

How do you handle Big Sale day traffic spikes?

Volume spikes during Republic Day sale, Big Billion Days, Diwali or an influencer drop can hit 50 to 100x your baseline. Two things break: vendor throughput ceilings and DLT template rejection rates. We pre-warm two SMS vendors 10 days ahead, get campaign-specific templates approved, set up hot-standby WhatsApp BSP, and run a live delivery dashboard on the day itself. Failed messages retry across the second vendor within 20 seconds. During the last Diwali sale we held delivery above 99.4 percent for one client at 8x normal peak traffic.

How is refund status communicated to reduce support tickets?

Every refund state change (initiated, approved, processed by payment gateway, credited to source) triggers a message on WhatsApp with the exact amount, reference ID and expected credit date. This alone cuts refund-related support tickets by 40 to 60 percent for most catalogs. The magic is expected credit date, which most brands do not show because they never wire the payment gateway ETA back to the customer. We handle the Razorpay, Cashfree, Paytm and PhonePe status webhooks and translate them into plain-language updates.

Stop losing orders to silent messaging failures

15-min call. Tell us your order volume, current vendors, next sale date. We come back with a delivery health audit and a pricing plan in 48 hours.

Chat with Deci Send Requirements →