curl --request POST \
  --url https://{your-subdomain}.neetokb.com/api/external/v2/tags/merge \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <x-api-key>' \
  --data '
{
  "primary_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "secondary_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

const options = {
  method: 'POST',
  headers: {'X-Api-Key': '<x-api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    primary_id: '3c90c3cc-0d44-4b50-8888-8dd25736052a',
    secondary_ids: ['3c90c3cc-0d44-4b50-8888-8dd25736052a']
  })
};

fetch('https://{your-subdomain}.neetokb.com/api/external/v2/tags/merge', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{your-subdomain}.neetokb.com/api/external/v2/tags/merge"

payload = {
    "primary_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "secondary_ids": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"]
}
headers = {
    "X-Api-Key": "<x-api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "tag": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "Billing",
    "description": "<string>",
    "style": "secondary",
    "articles_count": 2
  }
}

{
  "error": "Not found."
}

{
  "error": "<string>"
}