A certificate is a record that an organization says you finished its course. Any organization can issue one, about anything, and the words on it are chosen by the people selling it. A license is permission from a government to do a regulated activity, granted on conditions the government sets and revocable if you breach them.
For psilocybin the second is the one that decides whether you may legally be in the room. Oregon and Colorado both built their programs the same way: the state approves specific training curricula, and only graduates of an approved curriculum can be licensed. The approval list is public in both states, which means the central question about any course you are considering has a free, instant, authoritative answer.
This matters because the advertising does not distinguish. “Certification”, “credential”, “accredited” and “training” all appear in campaigns for courses costing thousands of dollars that lead to no license anywhere. Some of those courses are perfectly good continuing education for clinicians who already hold a license to practice something else. They are simply not what a person who wants to become a psilocybin facilitator is looking for, and the pages selling them are not always careful about the difference.
There is a fair version of this, and it is worth naming because it shows what good practice looks like. At least one organization on Oregon’s approved list also sells a shorter, cheaper certification aimed at licensed therapists, and states on that program’s own page that it is not an OHA-approved training for licensure under the Oregon Psilocybin Services Act. That sentence is what every one of these pages should contain. Where it is missing, ask why.