We generate a one-time link for the other person and a retrieval link for you. Your secret is encrypted end-to-end.
Send this link to the person who has the credentials. Their submission is encrypted against your public key before it leaves their browser.
Save this link now. Without it, the secret cannot be opened. We cannot recover it for you - the private key lives only in the URL fragment in your browser.
Once the sender submits, open this link to decrypt the secret. Bookmark it or copy it somewhere safe before you leave this page.