# Update an existing participant in the conversation

**POST /v1/Services/{ChatServiceSid}/Conversations/{ConversationSid}/Participants/{Sid}**

Update an existing participant in the conversation
A Service Participant resource represents a member of the conversation within a specific service.

## 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
- **ChatServiceSid** (string)
  The SID of the [Conversation Service](https://www.twilio.com/docs/conversations/api/service-resource) the Participant resource is associated with.
- **ConversationSid** (string)
  The unique ID of the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for this participant.
- **Sid** (string)
  A 34 character string that uniquely identifies this resource.


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

- **DateCreated** (string(date-time))
  The date on which this resource was created.
- **DateUpdated** (string(date-time))
  The date on which this resource was last updated.
- **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 [Conversation SDK](https://www.twilio.com/docs/conversations/sdk-overview) to communicate. Limited to 256 characters.
- **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.
- **RoleSid** (string)
  The SID of a conversation-level [Role](https://www.twilio.com/docs/conversations/api/role-resource) to assign to the participant.
- **MessagingBinding.ProxyAddress** (string)
  The address of the Twilio phone number that the participant is in contact with. 'null' value will remove it.
- **MessagingBinding.ProjectedAddress** (string)
  The address of the Twilio phone number that is used in Group MMS. 'null' value will remove it.
- **LastReadMessageIndex** (integer | null)
  Index of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.
- **LastReadTimestamp** (string)
  Timestamp of last “read” message in the [Conversation](https://www.twilio.com/docs/conversations/api/conversation-resource) for the Participant.


## Responses
### 200
OK
#### 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.
- **chat_service_sid** (string | null)
  The SID of the [Conversation Service](https://www.twilio.com/docs/conversations/api/service-resource) the Participant resource is associated with.
- **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 [Conversation SDK](https://www.twilio.com/docs/conversations/sdk-overview) 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 on which this resource was created.
- **date_updated** (string(date-time) | null)
  The date on which 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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