# Start a passwordless authentication

Starts a passwordless authentication.

IMPORTANT: For passwordless authentication, first is required to send a POST to request an email to be sent to the user’s email with a link for the user to click on to verify his email.

Endpoint: POST /v3/users/token-exchange
Version: 2026-01-08
Security: ZephrHmacHttp

## Request fields (application/json):

  - `identifiers` (object, required)
    Example: {"email_address":"joe.blow@company.com"}

  - `identifiers.email_address` (string)
    Example: "joe.blow@company.com"

  - `delivery` (object, required)
    Example: {"method":"email","destination":"joe.blow@company.com","action":"login","redirect":"/"}

  - `delivery.method` (string)
    Example: "email"

  - `delivery.destination` (string)
    Example: "joe.blow@company.com"

  - `delivery.action` (string)
    Example: "login"

  - `delivery.redirect` (string)
    Example: "/"


## Response 201 fields

## Response 400 fields