Run it like a SaaS duplicate your current setup for their ip, they'll probably use something like yourapp.theirdomain.com. Keep control of the server and your

Run it like a SaaS duplicate your current setup for their ip, they'll probably use something like yourapp.theirdomain.com. Keep control of the server and your code just provide it to them as a private version of your SaaS app. I would price this at your current hosting costs x 2 + $200/mo to cover setup, added maint. + profit. Note/Build in possible data/bandwidth useage increases as they scale up usage in their contract or terms of service. If you're using stripe maybe setup a few bandwidth tiers above a base one you're setting them up on with private instance pricing. You can add this to a private instance pricing page too this might be popular. congrats/good luck.