Add New labels For Specific Contact

Add Contact Label

Base URL

https://apimobile.callproof.com

Endpoint

/api/contact/{id}/label

Purpose

Assigns a label to a contact. You can either create a new label by name, or attach an existing label by ID.

HTTP Method

POST

Headers

Header	Required	Description
Authorization	Yes	Bearer access token

Security

• Yes – Requires Bearer Token authentication.

Parameters

Path Parameters

Parameter	Type	Required	Description
id	integer	Yes	Unique identifier of the contact

Query Parameters

None.

Request Body

Parameter	Type	Required	Description
label	string	Conditional	New label name to create and assign (maximum 100 characters). Required when label_id is not provided
label_id	integer/string	Conditional	Existing label ID to assign to the contact. Required when label is not provided

Successful Response (200)

Indicates that the label was assigned to the contact successfully.

Field	Type	Description
clientStatusCode	integer	Status indicator for the client (for example, 200)
user_id	integer	Identifier of the authenticated user
company_id	integer	Identifier of the authenticated user’s company
message	string	Confirmation message (for example, "contact label added successfully")
uri	string	Requested resource URI

Error Responses

Status Code	Meaning
200	Validation failed – response body uses clientStatusCode 401 with the first validation error message
400	Bad Request – the label could not be added
401	Unauthorized – missing, invalid, or expired Bearer token

• Validation (HTTP 200, clientStatusCode 401) – Neither label nor label_id was provided, or label exceeds 100 characters.
• 400 – Contact not found ("Contact Not Found"), label already exists on the account ("Label already exists on this Account"), or another add error (for example, "Error while Adding Contact Label").
• 401 – Authentication failed or the access token is missing/expired.