Hi again,
#1. Issue: https://prnt.sc/1xkpkve
This is a notice to enter the purchase code for this plugin, but you do not need to care, the plugin is still working normally.
#2. Product point: you can refer this plugin
https://woocommerce.com/products/woocommerce-points-and-rewards/
#3. I resolved this issue, please recheck.
Sale price into: Violet with crossing the normal price(red color)
Please explain more or take screenshot on this issue.