How can I allow guest use at the charging station so that others can use the charging station (for a fee)?

The procedure for authorizing guest use depends on the authorization method used by the charging station.

You can allow a limited number of selected users to charge at a charging station using a 'Whitelist'.
See "How to add an additional charge pass to the charging station?" for further instructions.

It is also possible to give all users access to the charging station. Unknown RFID cards will then also be accepted.

Standalone charging stations do not share transaction data with other systems.

Therefor, any payment will need to be organized outside the charging station.
For charger connected to a back office, this will be arranged in the back office.

Via Alfen's back office (ICU Connect) you can choose between an authorization service provider or an authorization profile.

An authorization profile offers a combination of multiple authorization service providers. Based on the selected options you determine the range for guest use. The most extensive profile is 'Ext. Roaming'.

The back office will authorize offered charge cards by checking the validity with the selected authorization service providers. Valid charge cards can be used on the charging station and are maintained in the back office.

If the charge card is valid, the charging session will be started.

Because the charging station shares transaction data with the connected back office, it is possible to allow settlement. However, this is not done via Alfen.

It is also possible to choose to add individual RFID tags as valid authorization instead of an authorization profile.
For instructions on how to add charging cards in ICU Connect, see "How do I grant access to a charging station with a charge pass in ICU Connect?".

In case the charger is connected and managed by another back office, the authorization is also handled by that back office.

Guest use should therefor be requested and handled by your Chargepoint operator (CPO).