API - Get an error in POSTMAN

API - Get an error in POSTMAN

Hi
I'm introducing to use API and I'm testing across Postman and when I put the URL + Technician_key I receive this error:

{
"response_status": {
"status_code": 4000,
"messages": [
{
"status_code": 4007,
"type": "failed",
"message": "Invalid URL"
}
],
"status": "failed"
}
}

Anyone can help me?

Thanks in advance

                  New to ADSelfService Plus?