Prices endpoint on CLOB API docs seem unfinished

I was trying to fetch multiple markets' prices with the CLOB prices API, but the docs for it only tell me what to expect in the return statement.

I don't know what to use as a param on the endpoint to execute this function as it isn't made clear and the playground also doesn't contain which param/header to use 

https://docs.polymarket.com/api-reference/pricing/get-multiple-market-prices