Writing on phone OTP, WhatsApp, and Indian messaging.
Long-form engineering and product writing from the team building QuickAuth. No fluff, no thought-leadership. Real numbers, real code, real India-shaped problems.
21 posts · 6 topics
LATEST
Authentication18 AUG 20268 minHardik Patel
What an OTP actually costs in India (2026)
The rate card is the easy part. Two things decide an OTP bill that no rate card mentions — the category messages went out under, and whether you paid for the ones that never arrived.
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- The cheapest OTP API in India, and why it needs SMS fallbackNot the cheapest SMS route — WhatsApp first at ₹0.115, falling back to SMS only for the users it could not reach. About a third less than SMS-only, without giving up anyone.Hardik PatelAuthentication18 AUG 20267 min
- Interakt alternative in India: what to check before you switchInterakt is built for Shopify commerce journeys. If authentication is real volume, or the utility-vs-marketing category is deciding your bill, here is what to demand from an alternative.Hardik PatelWhatsApp18 AUG 20267 min
- AiSensy alternative in India: the two costs a broadcast tool hidesAlmost every Indian WhatsApp platform resells the same Meta pricing. Two invoices differ on message category and on whether you pay for undelivered messages — not on the rate card.Hardik PatelWhatsApp18 AUG 20267 min
- WhatsApp marketing stuck at 60–70% delivery? Here’s the fixA 60–70% delivery rate on WhatsApp marketing campaigns is common — and fixable. Why Meta throttles marketing sends, and how utility-lane routing on a direct Cloud API connection lifts delivery back up.Shruti PatelWhatsApp31 JUL 20268 min
- WhatsApp broadcast limits in India (2026): how many messages you can really sendWhatsApp broadcast lists cap at 256 contacts and the app throttles you fast. The Business API removes that cap — here are the real messaging-tier limits and how to scale sends safely.Shruti PatelWhatsApp24 JUL 20268 min
- WhatsApp AI assistant: what it can actually do for your businessAn AI assistant on WhatsApp answers customers in natural language, handles orders and hands off to a human when it should. Where AI beats a rules bot, where it does not, and how to deploy one safely.Shruti PatelAI24 JUL 20269 min
- WhatsApp Business API pricing in India (2026): the honest breakdownMeta charges per conversation, not per message, and the category (utility, authentication, marketing) decides the price. The real per-conversation rates, what BSPs add, and how to cut your bill.Shruti PatelWhatsApp24 JUL 202610 min
- Transactional SMS API in India (2026): DLT, routes and how to chooseA transactional SMS API for India means DLT registration, direct operator routes and sub-3s OTP delivery. What separates a good SMS API from a cheap one, and how SMS pairs with WhatsApp fallback.Hardik PatelSMS24 JUL 20268 min
- OTP API in India: how to add phone OTP verification (with examples)What an OTP API does, the send-and-verify flow, and a minimal example — plus the India specifics (SMS DLT, WhatsApp OTP, auto-read, anti-fraud) that decide your delivery.Hardik PatelAuthentication18 JUL 20269 min
- The best Twilio & MSG91 alternative in India for OTP + WhatsAppWhy Indian teams move off Twilio and MSG91 — INR billing, DLT handled for you, and one API for SMS, WhatsApp and voice OTP with fallback. An honest comparison.Hardik PatelAuthentication18 JUL 20268 min
- Running WhatsApp support as a team: shared inbox + CRMOne WhatsApp number, a whole support team. A shared inbox with built-in CRM lets you assign chats, track contacts, and reply in the 24-hour window.Shruti PatelWhatsApp19 JUN 20268 min
- Build a no-code WhatsApp chatbot (with optional AI)Drag-and-drop flows that reply, branch and update your CRM — then add AI only where it helps, with a clean human handoff. No developer required.Shruti PatelWhatsApp19 JUN 20269 min
- How to track WhatsApp template button clicks (the data Meta hides)Meta reports delivered and read on WhatsApp templates but no click data on URL buttons. How a tracked-redirect wrapper recovers per-campaign button attribution.Shruti PatelWhatsApp19 JUN 20267 min
- WhatsApp-first OTP with automatic SMS fallbackSend OTP on WhatsApp first — cheaper, higher-converting, no DLT — then fall back to DLT-registered SMS the moment it fails. How a fallback ladder works.Hardik PatelAuthentication19 JUN 20268 min
- Bulk WhatsApp campaigns that actually get deliveredReach your whole customer list, not just opted-in subscribers, by routing bulk messages through Meta’s utility template lane where content qualifies.Shruti PatelWhatsApp19 JUN 20269 min
- WhatsApp OTP vs SMS OTP in India (2026): cost, deliverability, DLTAt ₹0.115 per delivered auth template, WhatsApp OTP undercuts every Indian SMS route and skips DLT. The honest cost, deliverability and compliance comparison.Hardik PatelAuthentication08 JUN 20268 min
- How to avoid a WhatsApp Business Account ban in IndiaWABA bans trace to three causes: marketing-categorised bulk sends, weak template copy, and flat-rate blasting. How Meta flags accounts — and how to stay green.Shruti PatelWhatsApp08 JUN 20269 min
- DLT registration for SMS in India: the complete 2026 guideEvery business sending SMS in India must register on DLT — entity, header, then template. The full 2026 walkthrough: costs, timelines, and mistakes to avoid.Hardik PatelCompliance08 JUN 202610 min
- Why your WhatsApp utility template got rejected — and how to fix itMeta rejects 30-40% of utility-template submissions — mostly policy mismatches, not real violations. A categorisation-first rewriting playbook with examples.Shruti PatelWhatsApp21 MAY 20267 min
- Android SMS Retriever app-hash: the complete 2026 guideThe SMS Retriever API gives permission-free OTP autofill on Android — once you embed the 11-character app hash. How to compute, embed and test it safely.Hardik PatelAndroid21 MAY 20269 min