Property label

The label property is used inside button blocks and should hold the visible text for the button.

    "from" : "",
    "subject" : "Email with a single button",
    "content" : {
        "blocks" : [ {
            "type": "button",
            "label" : "Button"
        } ]

For more information and more examples, please check the documentation of button blocks.

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You can find this documentation page on GitHub.
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