A bookmark lets you conveniently store and replay a specific request.
How bookmarks work
Bookmarks are most useful as a library of representative use cases with which to develop and test your code. For example, a developer for an e-commerce store might bookmark a webhook that arrives as a result of a gift card order. They could label that bookmark "Gift Card Order Created," and replay that request when testing or troubleshooting that specific logic in their API.
Bookmarked request data is exempt from the archiving period and remains available as long as it is bookmarked.