curl --request POST \
  --url https://api2.rhombussystems.com/api/oauth/getApplicationByClientId \
  --header 'Content-Type: application/json' \
  --header 'x-auth-apikey: <api-key>' \
  --header 'x-auth-scheme: <x-auth-scheme>' \
  --data '
{
  "clientId": "AAAAAAAAAAAAAAAAAAAAAA"
}
'

import requests

url = "https://api2.rhombussystems.com/api/oauth/getApplicationByClientId"

payload = { "clientId": "AAAAAAAAAAAAAAAAAAAAAA" }
headers = {
    "x-auth-scheme": "<x-auth-scheme>",
    "x-auth-apikey": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-auth-scheme': '<x-auth-scheme>',
    'x-auth-apikey': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({clientId: 'AAAAAAAAAAAAAAAAAAAAAA'})
};

fetch('https://api2.rhombussystems.com/api/oauth/getApplicationByClientId', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

HttpResponse<String> response = Unirest.post("https://api2.rhombussystems.com/api/oauth/getApplicationByClientId")
  .header("x-auth-scheme", "<x-auth-scheme>")
  .header("x-auth-apikey", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"clientId\": \"AAAAAAAAAAAAAAAAAAAAAA\"\n}")
  .asString();

{
  "application": {
    "clientId": "AAAAAAAAAAAAAAAAAAAAAA",
    "clientSecretHash": "<string>",
    "contactEmail": "<string>",
    "description": "<string>",
    "name": "<string>",
    "orgUuid": "AAAAAAAAAAAAAAAAAAAAAA",
    "redirectUri": "<string>"
  },
  "error": true,
  "errorMsg": "<string>",
  "warningMsg": "<string>"
}