The first one is setting some custom content under its addonKey following the documentation, but the second addon needs to read that data. I have been trying but since the addonkey is different I cannot read it, is there a way to read the other addons’ custom contents?
The base url and the clientKey that you received on both apps would be the same at the time of the installation of your app (I’m not Atlassian so who knows if that will change - but I doubt it). So you can match those up from there.