How would I go about retrieving a user's UserUpgrade information from REST Api?

[luciz]

As the title says...

I can't find and GET methods surrounding this, so I'm hoping I'm just missing it, rather than having to implement something similiar myself.

What I really do need tho is to get the the duration of the upgrade and which upgrade, thanks in advance.
How would I go about retrieving a user's UserUpgrade information from REST Api?

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