Can't find docs for creating a Checkout

Hello! I’m currently working on integrating Coinbase checkout, but I’m having trouble finding the documentation for it. I’ve already managed to implement Coinbase charge by using ‘https://api.commerce.coinbase.com/charges’. However, when I switch to ‘https://api.commerce.coinbase.com/checkouts’, it doesn’t seem to function. Could you advise on what extra details I need to include for the checkout process to work properly?

EDIT: I get the server message “Requested info must specify desired customer info fields” but i want the user to be able to write his info in the Coinbase checkout.