Api returning GUID no XPath

Hi

I’m not sure if I’m missing a post or document that explains the following:
I have an API post request that only returns a GUID

Example:
“ada7f5d2-49ad-4e3f-b6bb-a940b45d388a”

I have no Json path to use to save this as a Global Variable.
How can I save this GUID to my Global Variable

Thanks