HOW CAN I SEARCH FOR PRODUCTS FROM SKU

[evdecocomtr]

I want to find the product by entering the sku of the variant in the search bar in the Dawn 15.2.0 theme, I send a request to the api with fetch, it still does not work in any way. I am trying the api request in postman, although I enter it correctly, it gives an invalid api key or access token error, can you help me?