Issue with Process order API request

Hello, I’ve been following the guide on using APIs to place a regular order (Using APIs to place a regular order) but on the last step, 6. Request order processing, I get a 404 response when trying to access the hyperlink (https://developers.vtex.com/vtex-rest-api/reference/order-placement-1#processorder). Anyone have the documentation for said api?

Regards.

Maybe this one?
Do authorization (vtex.com)