string(91) "{"error":{"cause":"INVALID_REQUEST","explanation":"Invalid credentials."},"result":"ERROR"}"

array(2) {
  ["error"]=>
  array(2) {
    ["cause"]=>
    string(15) "INVALID_REQUEST"
    ["explanation"]=>
    string(20) "Invalid credentials."
  }
  ["result"]=>
  string(5) "ERROR"
}