> ## Documentation Index > Fetch the complete documentation index at: https://help.commbox.io/llms.txt > Use this file to discover all available pages before exploring further. # Create Child Object > This API creates a message (child) in a conversation (object) on behalf of the agent, sending it to the customer, or on behalf of the customer, displaying it to the agent.
The API returns the new child’s ID.


Required path parameters include the Stream (channel) ID and the Object (conversation) ID.

Required body parameters for a message on behalf of the customer:
a) The data “Type” see Enum at https://www.commbox.io/api/#section/Enums/ObjectType
b) UserStreamProviderId – the email or phone number of the person you are sending the message on their behalf.
c) UserStreamProviderType of the channel. See Enum at https://www.commbox.io/api/#section/Enums/StreamProviderType
d) The messages

Required body parameters for a message on behalf of the agent:
a) The data “Type” - See Enum at https://www.commbox.io/api/#section/Enums/ObjectType
b) Add this Boolean field 'IsManager': true,
c) Enter the agent’s user ID 'UserIdentity' : 34168,
Get the agent's User ID by using the Get Managers API https://api.commbox.io/managers
d) UserStreamProviderId – the email or phone number of the person you are sending the message on their behalf.
e) UserStreamProviderType of the channel. See Enum at https://www.commbox.io/api/#section/Enums/StreamProviderType
f) The messages

**Note:** After 24 hours from last sent message, APIs messages sent to customers will be blocked by WhatsApp.

POST /streams/STREAM_ID/objects/OBJECT_ID/child
POST /streams/STREAM_ID/objects/STREAM_PROVIDER_ID/STREAM_PROVIDER_TYPE/child ## OpenAPI ````json POST /streams/{STREAM_ID}/objects/{OBJECT_ID}/child { "openapi": "3.0.3", "info": { "title": "CommBox API", "x-logo": { "url": "https://www.commbox.io/logo/commbox_logo_large.png" }, "version": "2.07", "termsOfService": "https://www.commbox.io/end-user-license-agreement-eula/", "contact": { "name": "commbox", "url": "https://www.commbox.io", "email": "contactus@commbox.io" } }, "servers": [ { "url": "https://api.commbox.io/", "description": "Production server" } ], "security": [ { "BearerAuth": [] } ], "tags": [ { "name": "Core", "description": "

Systemwide verification" }, { "name": "Objects", "description": "

Objects are conversations between the AI Agent or the human agent and the customers, where each segment of the conversation is referred to as a Child. Every conversation must have a designated Stream – a communication channel such as Chat, Email, Text/SMS, etc., through which the conversation takes place.
The Object APIs category concentrates on a specific conversation, where the Stream is part of the identifying parameters. In contrast, the Streams APIs category, the Channel is the focal point of the request, and the objects and users are the filtering aspects." }, { "name": "Media", "description": "Converting media files to Base64" }, { "name": "AI Services", "description": "APIs that provide AI capabilities by the platform. " }, { "name": "Streams", "description": "

Streams are communication channels used in CommBox, such as Chat, WhatsApp, SMS/Text, etc. In the Streams category of APIs, the channel is the focal point of the request, and the objects and users are the filtering aspects. See the Enums Section for available channels and their CommBox code." }, { "name": "Tags", "description": "

Tags are a classification tool for summarizing aspects of the conversation or the user. It can mark the conversation to indicate a new sale or identify a customer as not interested in the product. To help manage the Tags assets, Tags can be grouped with a common identifier." }, { "name": "SMS", "description": "

Sending customers **SMS messages** (Texting) requires an initial opt-in step, which is not offered by CommBox and is the sole responsibility of the sending entity (Business)." }, { "name": "WhatsApp", "description": "

CommBox facilitates activities in **WABA** for the clients. Our platform helps clients create new templates and manage existing ones.

**Opt-in for WhatsApp**
Before sending WhatsApp messages to someone, you must first receive opt-in permission confirming that they wish to receive future messages from you on WhatsApp. This can be done using any channel your business uses to communicate with people — your website, app, email, retail location, etc.