Is it possible to use CSP license from Citrix partner without management services? Just pay for CSP license monthly (pay as you go)

It is up to the CSP. They can offer a "basic" package that provides just the licenses. But it is unlikely as CSP licensing requires the CSP to provide your first call for support. If you have a problem, you have to call the CSP who is supposed to troubleshoot first, then call Citrix. So, this usually requires some additional fees.

The customer cannot call Citrix support. It has to be run through the CSP partner.

Yep

I can make a Citrix csp specific channel if needed for more discussions. Let me know.

If you do, just go ahead and add me.