Go to rewards.xbox.com and sign up they give you Microsoft points for purchases on the microsoft store and xbox live
However, pre orders do not count unless it is a thing for "my missions"
I've gotten over 200,000 points back (200 dollars)
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Don't pre order digitals in general, regardless of system. I order from stores, that way I can cancel. I'll pre order digitals if it's a remastered edition like Skyrim, or something I know for a fact I'll enjoy.