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