# Silent re-authentication

Another way of retrieving updated information about the customer is to use the silent re-authentication flow. This is, in essence, the same flow described in [Sign in customers](https://docs.pliro.co/connect/sign-in-customers) but without presenting the sign in screen to the customer.

You activate the silent re-authentication flow by including a `prompt` query parameter with the value `none` in the [authorization request](https://docs.pliro.co/sign-in-customers#step-1-request-an-authorization-code).

If the customer is already signed into Pliro they will immediately be redirected to the `redirect_uri` with an authorization code.

If they are not signed into Pliro, the customer will be redirected to the `redirect_uri` with an `error` parameter set to `login_required`. At this point, you should consider signing the customer out of your website.


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