Buttons reply contains a collection of buttons to render.
Each button can be a simple button or a link to external URL.

There is a format of this reply type

"type": "buttons",
"buttons": [
{"text": "Cancel"},
{"text": "Details", "url": "https://someurl.com"}

Simple button

The tap on simple button just sends a text of this button as a new user request. User can use these buttons instead of speaking of next command.

Link button

Every link button contains url field with direct URL to the external resource like a website. If user presses this button an assistant should open this URL in a web browser.
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