authenticateCompletable

Authenticate a user with their email address and password. This endpoint verifies that the user has a password currently set, and that the entered password is correct.

There are two instances where the endpoint will return a reset_password error even if they enter their previous password:

1. The member's credentials appeared in the HaveIBeenPwned dataset. We force a password reset to ensure that the member is the legitimate owner of the email address, and not a malicious actor abusing the compromised credentials.

2. The member used email based authentication (e.g. Magic Links, Google OAuth) for the first time, and had not previously verified their email address for password based login. We force a password reset in this instance in order to safely deduplicate the account by email address, without introducing the risk of a pre-hijack account-takeover attack.

Parameters