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To facilitate this, the passthrough function `.usingAuth()` allows you to pre-define the auth context of the next API call.
```swift
-// assume Usergrid.authFallback = .None
+// assume Usergrid.authMode = .None
Usergrid.usingAuth(Usergrid.appAuth!).POST("roles/guest/permissions", jsonBody: ["permission" : "get,post,put,delete:/**"] ) { response in
// here we've temporarily used the client credentials to modify permissions
