Okay for now my thinking is to ask them to create us a unique email address that we can connect into Lindy.
Alternatively, it's about setting up their own Lindy account, BUT this isn't ideal for us as an agency as ideally we need to either handle the service for them and mark it up or white label it. Or will get cut out as a middleman having done all the hard work to develop it for them.
Happy to provide feedback as an agency owner if and when it works for your roadmap timeline Marvin A.