What is Lichess OAuth Authentication?

• Chess.Stream and CCCSA run online tournaments, and we use Lichess.org as a platform.
• Pairings will be managed by Chess.Stream, and the playing ground will be on Lichess.
• To be able to created a match for you, we need your OAuth Authentication.
• You have given OAuth at registration, but if you need to change the lichess account that you are going to use, you need to do it again here.
• Click 'CONTINUE LICHESS AUTH' button below, sign in (or you may already) in Lichess, and authorize it.
• It may take several seconds (5-20 seconds) to complete the authorization.
• You will be redirected back to this page for confirmation.
• At last, you still have to Contact Us explaining why you change your account and let me know what was your old account.