Confluence Cloud have webhooks, but not in Server & Data Center. Also, at the moment, Jira supports webhooks.

To be able to integrate Confluence with other tools we need Webhooks. https://en.wikipedia.org/wiki/Webhook 

Webhooks are the defacto standard today and many tools (chat, ticket systems, bugtrackers, runners, CI, etc. pp) support them.

You already have all the Webhook events available in Confluence Cloud

Confluence Webhook events

• attachment_created
• attachment_removed
• attachment_restored
• attachment_trashed
• attachment_updated
• attachment_viewed
• blog_created
• blog_removed
• blog_restored
• blog_trashed
• blog_updated
• blog_viewed
• blueprint_page_created
• comment_created
• comment_removed
• comment_updated
• connect_addon_disabled
• connect_addon_enabled
• content_created
• content_restored
• content_trashed
• content_updated
• content_permissions_updated
• group_created
• group_removed
• label_added
• label_created
• label_deleted
• label_removed
• login
• login_failed
• logout
• page_children_reordered
• page_created
• page_moved
• page_removed
• page_restored
• page_trashed
• page_updated
• page_viewed
• relation_created
• relation_deleted
• search_performed
• space_created
• space_logo_updated
• space_permissions_updated
• space_removed
• space_updated
• theme_enabled
• user_created
• user_deactivated
• user_followed
• user_reactivated
• user_removed

In addition an admin page is needed, where webhooks can be created.