Is it possible for multiple people to use it? Also, in that case, is it possible to set user permissions so that only certain promotions can be viewed and operated?

Yes, it is possible for multiple people within a team to use it. Additionally, user permission settings can be configured to limit usage to certain promotions.

By clicking the icon in the upper right corner of the Shirofune management screen → Team Settings → New Add button in Member Management, you can invite other users.

At that time, by setting the user's role to "Operator" and selecting the target promotion before inviting the user, it is possible to add users with limited usage.

For more details on user permissions, please refer to the article below.

https://shirofune.zendesk.com/knowledge/articles/360003798292/en-us?brand_id=114094056092