Create items and bundles

Creates multiple items or bundles along with their attributes. In addition, this endpoint supports data validation to ensure accuracy and consistency.
Note:
1) As a prerequisite category and attributes must be created beforehand.
2) To add an item variant, parentSku must be additionally specified.
3) An item is assigned to only one category but it can be fetched from Alternate categories.
4) Up to 50 items or bundles can be added.