Learn the WhatsApp Business API

Plain-language guides to how WhatsApp for business works, based on Meta's own documentation.

• The WhatsApp 24-hour rule explained

  The WhatsApp 24-hour rule in plain words: what opens the customer service window, what you can send inside and outside it, and what it costs since October 2026.

• WhatsApp Business app vs API: the differences

  WhatsApp Business app vs API compared: who each one is for, team use, templates, automation and costs, and how Coexistence lets one number use both at once.

• WhatsApp Coexistence: the app and the API on one number

  WhatsApp Coexistence lets one number use the WhatsApp Business app and the Cloud API together. See how onboarding works, what syncs and what changes.

• WhatsApp green tick verification: what it takes

  How the WhatsApp green tick works today: the Official Business Account badge, Meta's eligibility rules, how to request it and what to do if Meta says no.

• WhatsApp opt-in: how to collect consent the right way

  WhatsApp opt-in rules from Meta: what consent must say, accepted ways to collect it, how to handle opt-outs, and how good opt-in protects your quality rating.

• WhatsApp quality rating and messaging limits

  WhatsApp quality rating and messaging limits explained: what Meta measures, the 250 to unlimited tiers, how to raise your limit and avoid paused templates.

• WhatsApp template approval: how to get templates approved

  WhatsApp template approval explained: marketing, utility and authentication categories, Meta's review process and the common reasons templates get rejected.

• WhatsApp API pricing: how Meta charges per message

  WhatsApp API pricing explained: how Meta charges per delivered message, what changed on 1 October 2026, the 1,000 free service messages and volume tiers.