It's a Gmail feature called "Actions" and was launched back in 2013: https://developers.google.com/gmail/actions/actions/actions-overview https://developers.go

It's a Gmail feature called "Actions" and was launched back in 2013: https://developers.google.com/gmail/actions/actions/actions-overview https://developers.google.com/gmail/actions/actions/actions-... I'm actually surprised so few companies have implemented it thus far.