Add more details into tutorial page about bingAPI
I think you need to add one more paragraph between second and third on https://docs.microsoft.com/en-us/advertising/guides/walkthrough-desktop-application-python?view=bingads-13
Because for start example which you can find there you need to set up "Redirect URIs" for web application. Without it will give you error-response
"invalidrequest: The provided value for the input parameter 'redirecturi' is not valid. The expected value is a URI which matches a redirect URI registered for this client application."
Just add paragraph as third point with some information about it.
Eric Urban commented
Please note this walkthrough is specific to a desktop implementation that does not require client secret or custom URI. The web app registration is covered here:
Does this help?