On the official program material, a gift to the U.S. government together with a processing fee, alongside the eligibility and admissibility requirements the process itself sets. Confirm the current terms before acting.
Your own record first, then the official text
The government's program page and its frequently asked questions are the description to rely on, and no other source should be treated as authoritative. This is not a conventional visa category with a statutory list of conditions of the sort that governs professional entry, company transfers, treaty investment or immigrant investment, and it should not be described as one. What it shares with every route is admissibility: a payment does not overcome a ground of inadmissibility, and a prior refusal, an overstay or a criminal matter is assessed under general law regardless of the process chosen.
Begin therefore with your own record, then with the current official terms, and record the date on which you read them. Because those terms have been revised, any figure quoted from memory or from a secondary summary should be treated as unverified.