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CCS Chat Docs

Look up tenant members

GET
/api/v1/tenants/{tenant_id}/applications/{application_id}/users/lookup
curl --request GET \
  --url 'https://chat.centralcodestation.com/api/v1/tenants/example/applications/example/users/lookup?q=example' \
  --header 'Authorization: Bearer <token>'

Members Chat already knows (min 2 characters, max 20 results); with users.lookup.directory also the Identity Server directory.

Users in the guides

Authorizations

Section titled “Authorizations”

Parameters

Section titled “Parameters”

Path Parameters

Section titled “Path Parameters”
tenant_id
required
string

The Identity Server tenant id.

application_id
required
string

The Identity Server id of a chat-enabled tenant application.

Query Parameters

Section titled “Query Parameters”
q
required
string

At least 2 characters.

Responses

Section titled “Responses”

200

Section titled “200”

Success.

Media typeapplication/json
object
items
required
Array<object>
object
user_id
required
string
display_name
required
string
email
required
string
nullable
avatar_url
required
string
nullable

Example 

{
  "items": [
    {
      "user_id": "client-john",
      "display_name": "John Client",
      "email": "john@example.com",
      "avatar_url": null
    }
  ]
}

400

Section titled “400”

Error. error is one of: query_too_short, query_too_long.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 400,
  "error": "query_too_short",
  "message": "The user lookup query `q` has fewer than 2 characters.",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

401

Section titled “401”

Error. error is one of: invalid_token, token_revoked.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 401,
  "error": "invalid_token",
  "message": "The bearer token is missing, malformed, expired, signed by an unknown key, has the wrong audience (`aud` must be `chat-api`), or lacks the required scope.",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

403

Section titled “403”

Error. error is one of: not_tenant_member, no_application_access, tenant_not_available, insufficient_scope, client_context_mismatch, missing_capability.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 403,
  "error": "not_tenant_member",
  "message": "The user is not an active member of the tenant in the URL.",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

404

Section titled “404”

Error. error is one of: application_not_found.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 404,
  "error": "application_not_found",
  "message": "The application does not exist in the tenant, or Chat is not enabled for it.",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

429

Section titled “429”

Error. error is one of: rate_limited.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 429,
  "error": "rate_limited",
  "message": "The caller exceeded a rate limit",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

503

Section titled “503”

Error. error is one of: identity_unavailable.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 503,
  "error": "identity_unavailable",
  "message": "Chat could not reach the Identity Server and has no fresh cached answer.",
  "path": "/api/v1/tenants/fitness/applications/fitness-app/conversations",
  "timestamp": "2026-10-14T09:30:00.000Z"
}

default

Section titled “default”

Error — see error for the code.

Media typeapplication/json
object
status_code
required
number
error
required

Stable snake_case error code.

string
Allowed values: invalid_request invalid_cursor invalid_limit body_too_long query_too_short query_too_long user_required invalid_json invalid_id_token invalid_redirect_uri too_many_attachments role_locked invalid_grant invalid_token token_revoked missing_capability insufficient_scope not_tenant_member no_application_access tenant_not_available not_conversation_member client_context_mismatch principal_not_allowed system_message_not_allowed chat_access_not_granted not_found application_not_found role_not_found payload_too_large target_user_not_eligible actor_not_member conversation_archived direct_conversation_immutable invalid_reply rate_limited server_error identity_unavailable
message
required
One of:
string
path
required
string
timestamp
required
string format: date-time

Example 

{
  "status_code": 403,
  "error": "invalid_request",
  "message": "Missing Chat capability messages.send",
  "path": "/api/v1/tenants/t1/applications/a1/conversations"
}