---
title: "Add participants"
method: POST
path: "/v1/messaging/whatsapp/wa-groups/{groupId}/participants"
tags: ["WhatsApp"]
---

# Add participants

`POST /v1/messaging/whatsapp/wa-groups/{groupId}/participants`

## Request

- Base URL: `https://apihub.co.il`
- URL: `https://apihub.co.il/v1/messaging/whatsapp/wa-groups/{groupId}/participants`
- Auth: HTTP bearer

Add participants to a WhatsApp group. Maximum 8 participants per request. A group holds at most 8 participants in total (a Meta limit), so later requests cannot grow a group past 8. Meta documents groups as invite-only, so people normally join through the group's invite link.

Not available on [Coexistence](/platforms/whatsapp/connection#whatsapp-business-app-coexistence) numbers. Requires a Cloud API-only number.


**Billing:** Request; paid actions are priced in credits (see GET /v1/messaging/prices) · **Rate limit:** 60/min

## Path parameters

- `groupId` string, required: Group ID

## Query parameters

- `accountId` string, required: WhatsApp account ID

## Headers

- `Idempotency-Key` string
- `X-Tag` string

## Request body

- object
  - `phoneNumbers` string[], required: Phone numbers in E.164 format (max 8)

## Response `200`

Completed

- object
  - `id` string: Execution id — stable across internal retries; use it with GET /v1/executions/{id}
  - `status` 'pending' | 'processing' | 'completed' | 'partial' | 'failed' | 'cancelled' | 'timeout'
  - `operation` string
  - `tag` string, nullable: Your X-Tag, if sent
  - `created_at` string, date-time
  - `completed_at` string, date-time, nullable
  - `output` object: Operation result (see each operation). While a Studio render is processing: `stage` (queued · transcribing · downloading · preparing · cleaning_voice · mixing_audio · rendering · finishing), `phase` (the engine's: download · prepare · voice · audio · encode · qa · upload, or null), `progress` (a percent, 0–100) and `progress_fraction` (0–1), `eta_seconds` (seconds left, never below 0) and `estimate_seconds`
    - `message` string
    - `success` boolean
  - `error` string, nullable
  - `usage` object
    - `credits_charged` number, nullable
    - `credits_reserved` number
    - `estimated_credits` number
    - `cost_source` 'provider_reported' | 'calculated' | 'estimated' | 'null', nullable
    - `provider_usage` object, nullable: Normalised consumption, e.g. { VIDEO_SECOND: 22.4 }
  - `balance` object
    - `available` number
    - `reserved` number

## Other responses

- `400`: Invalid input
- `402`: Insufficient credits / project budget
- `404`: Resource not found (or not yours)
- `429`: Rate limited
- `503`: Service temporarily paused

---

[API](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai.md) · [All operations](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/revisions/a8caa42835ce?raw)