private void handleErrorResponse(string responseText, string errorText)
    {
        //attempt to parse error response
        API_ErrorResponse = JsonUtility.FromJson <PayPalErrorJsonResponse>(responseText);

        //if no responseText and only error text
        if (API_ErrorResponse == null)
        {
            API_ErrorResponse         = new PayPalErrorJsonResponse();
            API_ErrorResponse.message = errorText;
        }
    }
 private void handleErrorResponse(string responseText, string errorText)
 {
     //attempt to parse error response
     API_ErrorResponse = JsonUtility.FromJson <PayPalErrorJsonResponse>(responseText);
 }