The definition of a successful response is when you made a valid request that functioned as intended.

A successful response will return with a HTTP status code in the 200 range.

The definition of a failed response is when you made a invalid request that did not function as intended.

A failed response will return with a HTTP status code in the 400 or 500 range.

A failed request will return an error in the response, all errors have the same structure.

{
  "ErrorInformation": {
    "error": 1,
    "message": "Kan inte hitta kontot.",
    "code": 2000423
  }
}