As above! There's a few nuances though.
Most profiles will have 3 Review Source options:
Seller Invite: G2 allows you to create unique URLs for campaigns. If you are providing customers with a direct URL, this would constitute seller invite.
G2 Invite on Behalf of Seller: Campaigns that are run by G2 on your behalf, where you provide a list of customer contacts and G2 sends the emails.
Organic: Customer finds your G2 profile on their own and leaves a review.