code: def __generate_new_sandbox_user():
      
  
      url = ApiEnvironmentType.SANDBOX.uri_base + __ENDPOINT_SANDBOX_USER
  
      headers = {
          ApiClient.HEADER_REQUEST_ID: __UNIQUE_REQUEST_ID,
          ApiClient.HEADER_CACHE_CONTROL: ApiClient._CACHE_CONTROL_NONE,
          ApiClient.HEADER_GEOLOCATION: ApiClient._GEOLOCATION_ZERO,
          ApiClient.HEADER_LANGUAGE: ApiClient._LANGUAGE_EN_US,
          ApiClient.HEADER_REGION: ApiClient._REGION_NL_NL,
      }
  
      response = requests.request(ApiClient._METHOD_POST, url, headers=headers)
  
      if response.status_code is ApiClient._STATUS_CODE_OK:
          response_json = json.loads(response.text)
          return endpoint.SandboxUser.from_json(
              json.dumps(response_json[__FIELD_RESPONSE][__INDEX_FIRST][
                             __FIELD_API_KEY]))
  
      raise BunqException(_ERROR_COULD_NOT_CREATE_NEW_SANDBOX_USER)
docs: :rtype: endpoint.SandboxUser