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To add a tag to an existing contact, use the Update Contact (PUT /api/contacts/{id}) endpoint. Provide the complete updated array of tagsId in the request body. Ensure you include both existing tags and the new tag you wish to add, as this operation replaces the entire array. Example Payload: 
{
  "tagsId": [
    "your_tag_id_1", // Existing tag
    "your_tag_id_2"  // New tag to add
  ]
}