Remote Event Receivers (RER) in SharePoint Online

Just like event receivers in the classic model, Remote Event Receivers (RER) in SharePoint Online also have before events and after events. Also called as synchronous and asynchronous events.

If you are not aware of this, what this essentially means is synchronous events are the -ing events. For example ItemAdding event where we can do a validation and cancel the event if the validation did not pass.
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