// Choose an authentication method
var authentication = new TokenAuthentication(myToken);
// or: var authentication = new AppIdAuthentication(appId, userId);

// New up a VaultClient using that authentication
var client = new VaultClient("https://my.vault.server:8200", authentication);

// Write a secret to the vault
var data = new Dictionary<string, object>() { { "password": "sushi" } };
await client.WriteAsync("secret/foobar", data);

// Lease a secret
var lease = await client.LeaseAsync("secret/foobar");
var password = lease.Data["password"];

// password == "sushi"