What is the Roblox API to create developer products?

So I have this url that I think is the right API to create a developer product from a browser https://apis.roblox.com/developer-products/v1/universes/{UniverseId}/developerproducts?name={Name}&priceInRobux={Price}. However, when I put the url in my browser, I get this error:


I tried to add the parameter “pageNumber” to the url but I got this:

And I dont know how to fix it. Any ideas?