# Add a new participant to the conversation

**POST /v1/Conversations/{ConversationSid}/Participants**

Add a new participant to the conversation
A Participant resource represents a member of the conversation.

## Servers
- https://conversations.twilio.com: https://conversations.twilio.com ()


## Authentication methods
- Account sid auth token


## Parameters
### Headers
- **X-Twilio-Webhook-Enabled** (string)
  The X-Twilio-Webhook-Enabled HTTP request header

### Path parameters
- **ConversationSid** (string)
  The unique ID of the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for this participant.


### Body: application/x-www-form-urlencoded (object)

- **Identity** (string)
  A unique string identifier for the conversation participant as [Conversation User](https://www.twilio.com/docs/conversations/api/user-resource). This parameter is non-null if (and only if) the participant is using the Conversations SDK to communicate. Limited to 256 characters.
- **MessagingBinding.Address** (string)
  The address of the participant's device, e.g. a phone or WhatsApp number. Together with the Proxy address, this determines a participant uniquely. This field (with proxy_address) is only null when the participant is interacting from an SDK endpoint (see the 'identity' field).
- **MessagingBinding.ProxyAddress** (string)
  The address of the Twilio phone number (or WhatsApp number) that the participant is in contact with. This field, together with participant address, is only null when the participant is interacting from an SDK endpoint (see the 'identity' field).
- **DateCreated** (string(date-time))
  The date that this resource was created.
- **DateUpdated** (string(date-time))
  The date that this resource was last updated.
- **Attributes** (string)
  An optional string metadata field you can use to store any data you wish. The string value must contain structurally valid JSON if specified.  **Note** that if the attributes are not set "{}" will be returned.
- **MessagingBinding.ProjectedAddress** (string)
  The address of the Twilio phone number that is used in Group MMS. Communication mask for the Conversation participant with Identity.
- **RoleSid** (string)
  The SID of a conversation-level [Role](https://www.twilio.com/docs/conversations/api/role-resource) to assign to the participant.


## Responses
### 201
Created
#### Headers
- **Access-Control-Allow-Origin** (string)
  Specify the origin(s) allowed to access the resource
- **Access-Control-Allow-Methods** (string)
  Specify the HTTP methods allowed when accessing the resource
- **Access-Control-Allow-Headers** (string)
  Specify the headers allowed when accessing the resource
- **Access-Control-Allow-Credentials** (boolean)
  Indicates whether the browser should include credentials
- **Access-Control-Expose-Headers** (string)
  Headers exposed to the client

#### Body: application/json (object)
- **account_sid** (string | null)
  The unique ID of the [Account](https://www.twilio.com/docs/iam/api/account) responsible for this participant.
- **conversation_sid** (string | null)
  The unique ID of the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for this participant.
- **sid** (string | null)
  A 34 character string that uniquely identifies this resource.
- **identity** (string | null)
  A unique string identifier for the conversation participant as [Conversation User](https://www.twilio.com/docs/conversations/api/user-resource). This parameter is non-null if (and only if) the participant is using the Conversations SDK to communicate. Limited to 256 characters.
- **attributes** (string | null)
  An optional string metadata field you can use to store any data you wish. The string value must contain structurally valid JSON if specified.  **Note** that if the attributes are not set "{}" will be returned.
- **messaging_binding** ()
  Information about how this participant exchanges messages with the conversation. A JSON parameter consisting of type and address fields of the participant.
- **role_sid** (string | null)
  The SID of a conversation-level [Role](https://www.twilio.com/docs/conversations/api/role-resource) to assign to the participant.
- **date_created** (string(date-time) | null)
  The date that this resource was created.
- **date_updated** (string(date-time) | null)
  The date that this resource was last updated.
- **url** (string(uri) | null)
  An absolute API resource URL for this participant.
- **last_read_message_index** (integer | null)
  Index of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.
- **last_read_timestamp** (string | null)
  Timestamp of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.


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