test

{
  "clientKey": "YOUR_API_KEY",
  "hello": "world"
}

{
  "errorId": 0,
  "received": {
    "hello": "world"
  }
}

curl -s https://unlock-api.com/test \
  -H "Content-Type: application/json" \
  -d '{"clientKey":"YOUR_API_KEY","hello":"world"}'

import requests

r = requests.post("https://unlock-api.com/test", json={
    "clientKey": "YOUR_API_KEY",
    "hello": "world"
}).json()
print(r)

const r = await fetch("https://unlock-api.com/test", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "clientKey": "YOUR_API_KEY",
    "hello": "world"
  }),
}).then((res) => res.json());
console.log(r);