How to add parameter to callbacks URL (redirect_url) after login

Our environment set up is multi tier meaning the Application is hosted in multiple hosts. What this means is the callback URL (redirect_url) may change depending on the organization that the user logs in with. To solve this problem, I’m looking into creating a proxy to route the callback to the right tiers/hosts. (proxy is used for all callback urls … authorize?redirect_url=

My question, is there a way to append a parameter in the callback URL after the user logs in? The new parameter will come from the organization metadata the user used to login with.