Walk-in users are people who are allowed to use your library but are not part of your organisation in a way that the already have credentials - e.g. a University Library might have an arrangement with the local community that the public can access library content within the library buildings.
There are a few things to consider that can influence how you provide access in these cases.
You will probably already have done so, but it is important to confirm with the publishers of any online content that your licence covers walk-in users... by the access methods you will be using for them.
OpenAthens offers an account type known as an 'Access account' which can be shared amongst users and has an IP based restriction on it so that you can limit it to your network or even (with the help of your IT team) to the computers used by walk-in users. The IP restriction means that it is perfectly acceptable to post the credentials on a sign on the wall or similar.
To create an access account, select it as the option in the Accounts > Add menu (for details see: Add - Access account)
The access account will access resources like any other account except for the location restriction
If your site uses local accounts - i.e. you have connected OpenAthens to your own directory for authentications - then access accounts are still likely to be the best solutions for walk-in users as each ID your systems pass us must represent an individual. The practicalities of this in use are:
Some federations do not allow for shared accounts and require that all users be uniquely identifiable (e.g. UK Access Management federation). Access accounts do not work where these restrictions exist.