Cafe One URL in different Environments and their Migration

Hello Mentors,

We plan to use Cafe One External URL Link embedded in one of our Custom JDE Applications. I have 2 Questions related with the same;

1. URLs will be different for different environments. How and where is it configurable in JDE Cafe One? Today in DV when i add the Cafe One page i put in the URL directly. After deployment we need to go in each environment and update the URL?
2. We want to also send token details so that the 3rd Party URL doesn't ask for a SignOn when being triggered from JDE. Is there a limitation to the Characters that can be passed? What are the best Practices around it? We don't want user to re-login into the new 3rd Party system .