Yes We've prepared a wiki article with a full list of commands for server owners.
https://survivalservers.com/wiki/index.php?title=Valheim_Admin_Commands
Your card details are not stored anywhere in our database. We simply take a transaction ID (if payment is made via PayPal) or a card reference ID (if using credit card through our payment processor Stripe)
That said, if you are paying with credit card (through Stripe) we can remove the link to your credit card and then delete it from your Stripe customer record.
Please submit a support ticket so we can handle that request.
Not to my knowledge AFAIK.
No we do not offer performance addons, all of our servers are high performance. If you are having issues with desync please submit a ticket and we'll diagnose.
Thanks for the kind words though Been a wild ride so far.
For starters, there's already a thread dedicated to Admin Commands.
And to answer your question those are for locally hosted servers only at this time and they do not work on dedicated servers (at our host or any for that matter)
It's currently not having any issues at this time. If you could please create a ticket so we can take a look why it's not for you.
As far as the description language, that's been changed. Thanks for letting us know!