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Chat App Message Service:ListChatGroupParticipants

Last Updated:Sep 29, 2026

Retrieves the member list of an IM group.

Operation description

Important The feature of retrieving IM group member lists through API is a Meta beta feature. Contact your account manager to apply for access.
  • Before calling this operation, make sure that the IM group you created has an IM group invitation link added and that members have joined the IM group through the link.

  • If you do not have a created IM group, use the AddChatGroup and AddChatGroupInviteLink operations to create an IM group and add an invitation link.

Try it now

Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

cams:ListChatGroupParticipants

list

*All Resource

*

None None

Request parameters

Parameter

Type

Required

Description

Example

BusinessNumber

string

Yes

The business phone number. You can view the business phone number by calling the ListChatGroup operation.

8613800***

ChannelType

string

No

The channel type. Valid values:

  • WHATSAPP

Note

Only the WhatsApp channel type is supported.

WHATSAPP

GroupId

string

Yes

The group ID. You can view the group ID by calling the ListChatGroup operation.

EA939****

CustSpaceId

string

Yes

The space ID of the ISV sub-customer, which is also the instance ID. This is the channel ID, which can be viewed on the Channel Management page.

cams-k***

Page

object

No

The pagination information.

Size

integer

No

The number of entries per page.

20

Index

integer

No

The page number.

1

Response elements

Element

Type

Description

Example

object

AccessDeniedDetail

string

The details about the access denial.

None

Message

string

The error message.

None

RequestId

string

The request ID.

90E63D28-E31D-1EB2-8939-A94866411B2O

Data

object

The returned data.

Total

integer

The total number of records.

8

List

array<object>

The list of group members.

object

The group member information.

ParticipantNumber

string

The group member number.

861382***

Code

string

The request status code. Valid values:

  • OK: The request was successful.

  • For other error codes, see Error codes.

OK

Success

boolean

Indicates whether the call was successful. Valid values:

  • true: The call was successful.

  • false: The call failed.

true

Examples

Success response

JSON format

{
  "AccessDeniedDetail": "None",
  "Message": "None",
  "RequestId": "90E63D28-E31D-1EB2-8939-A94866411B2O",
  "Data": {
    "Total": 8,
    "List": [
      {
        "ParticipantNumber": "861382***"
      }
    ]
  },
  "Code": "OK",
  "Success": true
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.