electron/docs/api/structures/notification-action.md

NotificationAction Object

• type String - The type of action, can be button.
• label String - The label for the given action.

Platform / Action Support

Action Type	Platform Support	Limitations
button	macOS	Maximum of one button, if multiple are provided only the last is used

Button support on macOS

In order for extra notification buttons to work on macOS your app must meet the following criteria.

• App is signed
• App has it's NSUserNotificationAlertStyle set to alert in the info.plist.

If either of these requirements are not met the button simply won't appear.