text: class AlipayException(Exception):
      '''Base Alipay Exception'''
  
  
  class MissingParameter(AlipayException):
      """Raised when the create payment url process is missing some
      parameters needed to continue"""
  
  
  class ParameterValueError(AlipayException):
      """Raised when parameter value is incorrect"""
  
  
  class TokenAuthorizationError(AlipayException):
      '''The error occurred when getting token '''
  