Add Tags to Contact

Add one or more tags to an existing contact. Tags already on the contact are preserved — duplicates are ignored.

Endpoint

POST https://api.campaignlark.com/v1/contacts/:id/tags/add

Parameter	Type	Required	Description
`id`	string	required	The contact ID.

Field	Type	Required	Description
`tag_ids`	array of integers	required	Tag IDs to add to the contact. Must contain at least one ID. All IDs must exist in the workspace.

POST https://api.campaignlark.com/v1/contacts/64f1a2b3c4d5e6f7a8b9c0d1/tags/add
Content-Type: application/json

{
  "tag_ids": [1, 3, 5]
}

Returns the full updated contact object.

Fires TAG_ADDED automations for any tags that were not already on the contact.

Status	Message	Cause
`400`	`The contact ID you provided is not valid.`	`id` path param is missing.
`400`	`Please provide at least one tag ID to add or remove.`	`tag_ids` is empty.
`400`	`Tag ID <id> does not exist in this workspace`	A provided tag ID is invalid.