DNS domain group website 3rd AAAA record word soup Dynadot noodles server soy sauce hostname IP address GoDaddy registrar $7 nigh sect need WHMCS module RIPE tax dedicated server Blesta.

Dude... VirtFusion! Uncontested! Features, UI, UX, Cost, Support, WHMCS. The whole thing!

Technically Proxmox does have a WebUI already, with all those features you require and an API etc too. WHMCS modules exist too for it.

WHMCS or billing integration

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Tbh, I have seen this popup on other whmcs systems immediately after the service is ordered and activated

WHMCS bug? That feature is called “On-Demand Renewals” in WHMCS. I only set it as an example: for 1-year services, the option becomes available 90 days before the due date; for 2-year services, 180 da

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Like all modern WHMCS installs does this. Not sure if default or a plugin, but login to some WHMCS hosts, most will have a notification saying a service renewing in like 11 months is about to expire.