checkNotificationMessageLength   
  fun checkNotificationMessageLength(notificationMessage: String?, notificationMessageMaxLength: Long = MomoConstants.NOTIFICATION_MESSAGE_LENGTH): Boolean
Checks if the length of the notification message is within the allowed limit.
Return
True if the message length is within the limit, false otherwise.
Parameters
notificationMessage 
The notification message to check.
notificationMessageMaxLength   
The maximum allowed length for the notification message.