# FAQ

- [Configuration Migration](/faq/configuration-migration.md)
- [Custom Attributes](/faq/custom-attributes.md): This article explains what custom attributes are and how they can help you better utilize the platform and implement your loyalty program.
- [Achievements](/faq/achievements.md)
- [Favourite Filters](/faq/favourite-filters.md)
- [GDPR](/faq/gdpr.md)
- [Opt-Out](/faq/opt-out.md): How to Allow Users to Opt-Out from the Loyalty Program
- [Referral Programs](/faq/referral-programs.md): This article explains how to provide users with the ability to invite friends to the loyalty program by sharing a unique referral link.
- [Returns and Cancellations](/faq/returns-and-cancellations.md)
- [Timezones](/faq/timezones.md): Understanding how timezones work in Open Loyalty