So i have my plugin called Aconomy and i want it to get supported by vault, what do i do
???

See the Gringotts economy project if you need examples on how to make your plugin interface with Vault. https://github.com/MinecraftWars/Gringotts/blob/master/src/main/java/org/gestern/gringotts/api/impl/VaultConnector.java

I don't provide interfaces for every single economy inside of Vault any longer as too many people are creating their own economies even though they are only used privately or on a couple servers (it's also really annoying when there are already so many working economies that are actively maintained).

Dude, myconomy supports cash, pincodes,banks, a kewl chest gui enter pincode thing and a fair trade system, i have seen nothing like this!