Rest API is throwing validation error

Rest API is throwing validation error (to provide at least item number, item description, keyword as input) . We need an API to help us achieve this requirement.

• We are passing DefaultBuyerValue as a filter to retrieve item details for a given buyer, however we are getting that we need to pass at least item number, item description, and keyword.
• As per our requirements, we will be filtering the data from DefaultBuyerValue, so we require a workaround to get correct data