olemus
liidestav URL, millele rakendus saadab teavet
=
an interface item giving directions to an external system on where to go next

ülevaateid
https://quickbooks.intuit.com/ca/resources/running-a-business/small-business-callback-url/

https://www.alertra.com/blog/2011/callback-urls-explained

https://auth0.github.io/auth0-oidc-client-net/documentation/getting-started/callbacks.html