includeVariants not working in query product rest api

  1. I am having problems querying products. I have added includeVariants flag to true to the query

but the result still doesn’t contain variants. it returned "variants": [],

Also, is there a rest api to search product by sku?

also, can wix change fulfillmemnt api so that if I am doing a complete fulfillment of an order (ship all line items), and make lineItems optional? e.g. if not supplied it means fulfill all line items in the order?

Can you share the code that is not working and confirm that the product you’re querying has variants defined?