# Assign tag to contact Assign a tag to a contact. Requires API key authentication. Endpoint: POST /api-assign-tag Version: 1.1.0 Security: ApiKeyAuth ## Request fields (application/json): - `contactId` (string, required) - `tagId` (string, required) ## Response 200 fields (application/json): - `success` (boolean) - `data` (object) ## Response 400 fields ## Response 401 fields ## Response 404 fields ## Response 500 fields