Hi,

I am not aware with the specifics of authenticating against Sharepoint, but if you need to provide access token or cookie with your request, you can first acquire them with a request to your respective authentication service. Once received as a response from your authentication service, you can use a Set Variable step (http://docs.telerik.com/teststudio-apis/features/steps/set-variable) to save your access token or cookie as a variable. Later, you can use that variable as a value of an Authorization header or Cookie header to authenticate your calls. You can see more info on how you can reference variables from a http request from here: http://docs.telerik.com/teststudio-apis/features/variables#Referencing-Variables.