1. Is Authme required?

Not required
If Authme is available, it will automatically get historical login time to determine return status
If not available, this plugin will record player offline time to determine

2. What if players create alt accounts to farm rewards?

It's okay, because besides daily sign-in rewards that are given immediately upon clicking
Other return shops and return tasks require time to complete to get rewards
Greatly improves player online rate

3. Version 1.7 or 1.8 shows garbled characters or cannot be used

Plugin defaults to UTF-8, please convert to ANSI encoding yourself