Guides
Practical notes on coexistence, the Cloud API, webhooks, pricing and AI agents on WhatsApp, written from building them for Indian businesses.
What is WhatsApp coexistence? Keep the number on the phone and use the API
Coexistence lets one WhatsApp Business number live on the WhatsApp Business app and on the Cloud API at the same time. What it is, what syncs, what does not, and who it is for.
2026-10-14
WhatsApp Business app vs WhatsApp Business API vs coexistence: which one you need
A plain comparison of the three ways a business can run a WhatsApp number: the free app, the Cloud API, and coexistence. Features, limits, cost and who should pick what.
2026-10-14
How to connect an existing WhatsApp Business app number to the Cloud API without losing the phone
Step-by-step: prerequisites, Meta Embedded Signup, the code scan from the WhatsApp Business app, what to check afterwards, and the mistakes that break the link.
2026-10-14
Receiving WhatsApp messages at a webhook: payloads, signatures, retries and the 24-hour rule
What a WhatsApp Cloud API webhook sends, how to verify it, how to make your endpoint idempotent, and why a connector should re-sign and retry on your behalf.
2026-10-14
What the WhatsApp Business Platform really costs in India, and what a connector should not charge
Meta's per-message charges by category, the free service window, what BSPs and connectors add on top, and how to keep the monthly bill predictable for an Indian SME.
2026-10-14
Build a WhatsApp AI agent for a small business: the architecture that works
How to put an AI assistant on a business WhatsApp number without losing the phone: coexistence, a webhook, a tool-using model, approval rules, and what to do about Hindi.
2026-10-14
Tally on WhatsApp: send ledgers, invoices and payment reminders from the business number automatically
How Indian SMEs connect Tally to WhatsApp without changing the number: coexistence, Tally's XML/HTTP interface, PDF generation, and the three automations that pay for themselves.
2026-10-14