Vault with Config Server

Want to use Config server in between Hashicorp vault and applications(.NET and Java). How to create policies according and pass generated token in to the application. Ex. in vault
Secret-Keys/App1/SIT Secret-Keys/App1/SIT
Secret-Keys/App1/UAT Secret-Keys/App1/UAT
Secret-Keys/App1/PROD Secret-Keys/App1/PROD