## Modify `client.groups.modify(GroupModifyParamsbody, RequestOptionsoptions?): GroupModifyResponse` **post** `/api/modify-group` Add or manage participants in a group chat (beta feature) ### Parameters - **body:** `GroupModifyParams` - **group\_id:** `string` Group identifier - **modify\_type:** `"add_recipient"` Type of modification to perform - `"add_recipient"` - **number:** `string` Phone number to add/modify in E.164 format ### Returns - `GroupModifyResponse` - **message:** `string` - **status:** `string` ### Example ```typescript import SendblueAPI from 'sendblue-api'; const client = new SendblueAPI({ apiKey: 'My API Key', apiSecret: 'My API Secret', }); const response = await client.groups.modify({ group_id: 'group_123456', modify_type: 'add_recipient', number: '+19998887777', }); console.log(response.message); ```