my SaaS application create subdomain for each customer customer.myapp.com. in my nginx i configured wildcard ssl certificate. (*.myapp.com) and it works.

how can I allow my customer to connect their own domain to their subdomain with ssl?

i.e customer.com => customer.myapp.com

I don't want to manually add certificate each customer. I want it to be automatically.

how could it have done with nginx?