Customize a brand new player trading platform with a budget of $20- $100

[laodu]

I need a brand-new custom version, with the following requirements:
I currently need a system where users can sell and buy products (including custom items), supporting both an economy and RP (role-play) mode. It must also record detailed results of successful transactions in the plugin. Whether the user is selling or buying, after the transaction is completed, they must manually retrieve their purchased items, money, or RP rewards from the plugin.