post https://a.klaviyo.com/api/catalog-items//relationships/categories/
Create a new catalog category relationship for the given item ID.
Rate limits:
Burst: 75/s
Steady: 700/m
Scopes:
catalogs:write
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Create a new catalog category relationship for the given item ID.
Rate limits:
Burst: 75/s
Steady: 700/m
Scopes:
catalogs:write