From here you can purchase in-game Gifts for yourself or All 'online' players at time of purchase.
Want to gift a package or addon to a friend?
Enter their Steam URL into this website https://steamid.io/
Then all you need to do is enter the Steam 64 Bit ID (steamID64 on the website) into the "Gift Package" box on the selected package!
Note: subscription packages may not be gifted.
You can select your currency via the dropdown menu at the top of the page.
Supported Payment Methods:
Credit/Debit Cards & PayPal
(contact Staff on discord for details)