We strongly advise against buying codes from third parties. These are often "burned" or invalid by the time you pay, and there is no buyer protection for such transactions. What to Do Once You Have a Code
3WiFi has deep roots in the security community. Monitoring threads on specialized forums is the traditional way users share invites. Keep an eye on "Giveaway" threads where long-standing members help newcomers.
There is no such thing as an automated code generator for this platform.