This article is the one you’ll want to read to understand how to accomplish this:
There is no specific API call to set variables; it’s part of site config. Watching our UI do it will show you the call and the data shape needed 
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This article is the one you’ll want to read to understand how to accomplish this:
There is no specific API call to set variables; it’s part of site config. Watching our UI do it will show you the call and the data shape needed