# Hello WhatsApp API

> Hello is a WhatsApp Business (Cloud API) platform. Its Integration API (`/v1`) lets a server send WhatsApp messages of every type, track delivery status, manage message templates and upload media, authenticated with a single API key.

- Each organization’s API base URL is shown in the Hello dashboard (Integrations); examples use `$HELLO_API_URL`. Every request sends `Authorization: Bearer <API key>`.
- Send any message type with `POST /v1/{phone_number_id}/messages`, the same request body as the WhatsApp Cloud API; the `type` field picks the shape (`text`, `template`, `image`, `video`, `audio`, `document`, `sticker`, `location`, `contacts`, `interactive`, `reaction`). `to` needs a leading `+` and country code.
- Every send is queued and returns `202` with `messages: [{id, message_status: "queued"}]`; poll `GET /v1/messages/{id}`. `?sync=true` waits up to 10s for `200` with WhatsApp’s `wamid`.
- Only `template` messages can start a conversation. Every other type needs an open 24-hour customer-service window, otherwise the API returns `403 OUTSIDE_24H_WINDOW`.
- Templates are managed per WhatsApp Business Account (WABA) at `/v1/{waba_id}/templates`, with a Meta-compatible create/edit body covering every template kind.
- Hello supports WhatsApp coexistence: a number can stay active in the WhatsApp Business app while also using the API, with replies from the phone synced to Hello.

## Documentation Sets

- [Abridged documentation](https://lakshyapocketlab.com/llms-small.txt): a compact version of the documentation for Hello WhatsApp API, with non-essential content removed
- [Complete documentation](https://lakshyapocketlab.com/llms-full.txt): the full documentation for Hello WhatsApp API

## Notes

- The complete documentation includes all content from the official documentation
- The content is automatically generated from the same source as the official documentation

## Optional

- [WhatsApp coexistence](https://lakshyapocketlab.com/whatsapp-coexistence/): Use the WhatsApp Business app and the API on the same number with Hello
- [WhatsApp Business app vs API](https://lakshyapocketlab.com/whatsapp-business-app-vs-api/): Feature and cost comparison, and when to use each
- [Order notifications](https://lakshyapocketlab.com/whatsapp-order-notifications/): Order, shipping and delivery updates on WhatsApp
- [Appointment reminders](https://lakshyapocketlab.com/whatsapp-appointment-reminders/): Booking confirmations and reminders with Confirm and Reschedule buttons
- [Invoices and documents](https://lakshyapocketlab.com/whatsapp-invoices-and-documents/): Invoices, receipts and tickets delivered as PDF documents
- [Marketing campaigns](https://lakshyapocketlab.com/whatsapp-marketing-campaigns/): Opt-in marketing campaigns with approved templates