Invite & earn is the simplest way to earn with Onyx: you share your link and, when a friend subscribes, you get plan credit and they also get a discount. It is meant for people close to you, not big audiences.
Where it is
In My account → "Referrals" tab. There you pick the "Invite & earn" card (green) and see your link, how many friends you invited, how many already paid and your accrued credit.
How it works
You copy your link and share it with a friend.
Your friend subscribes with that link and gets their discount.
After a maturation period (in case of refunds), your credit becomes available.
The credit is applied automatically to your next invoice: you don't have to do anything.
The difference with Ambassador: here you earn CREDIT on your plan (it is not withdrawn, it lowers what you pay). Ambassador gives you cash COMMISSION that you can withdraw to your bank or USDT.
Credit is only generated from real subscriptions. Referring yourself does not count, nor do accounts that cancel or get refunded within the maturation period.