Requires Vault
Tested on 1.8 but should be fine on other modern Minecraft versions.
Create banknotes and EXP bottles that players can sell on the market, give to their friends and store money/EXP in the form of redeemable items shown below.

By right clicking with these items, you can redeem their value. This is great for game modes like survival, factions and skyblock.
Commands:
/bottle <amount> (to create EXP bottles)
/banknote <amount> (to create banknotes)
All messages are configurable.
Any questions, do not hesitate to message me.
If you want anything added/changed, get in touch.
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