In my server have Ecoin = Credits
it mean member use real money to buy Ecoin and then use Ecoin to buy item in server.
So i want ask how i can make ecoin requirement to accept a quests from npc. i can only see Money requirment and other no Credits

Is it a virtual currency (such as an alternative to $$$ from a plugin) or item currency (such as renamed items e.g emeralds as 'Ecoin')?

Closed to due lack of response from OP.