curl --request DELETE \
  --url https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan \
  --header 'x-api-key: <api-key>'

const options = {method: 'DELETE', headers: {'x-api-key': '<api-key>'}};

fetch('https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan"

headers = {"x-api-key": "<api-key>"}

response = requests.delete(url, headers=headers)

print(response.text)

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "Invalid API key"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "Subscription not found"
  }
}

{
  "error": "A request with this idempotency key is already being processed"
}

{
  "error": "Idempotency key already used with a different request body"
}