Atlassian Connect - Customize /install request

Is it correct to say that there is no way to customize requests such as /install sent to the atlassian connect application from JIRA?

For example, for external requests to enter my companies network we must authenticate with an API key.

So the initial request, rather than using the mechanism outlined here Security for Connect apps, I presume it’s not possible to pass an API Key with the initial /install request (or other requests initiated from the JIRA server).

Welcome to the Atlassian developer community, @Chris4

Yes. I confirm there is no customization available for the Atlassian Connect lifecycle hooks.