workflow_button_basic.json

{
    "type": "workflow_button",
    "action_id": "run_workflow",
    "text": {
        "type": "plain_text",
        "text": "Run Your Workflow"
    },
    "workflow": {
        "trigger": {
            "url": "https://slack.com/shortcuts/Ft012KXZK1MZ/8831723c452aac3e87c6d3219bebd44c",
            "customizable_input_parameters": [
                {
                    "name": "name_a",
                    "value": "value_a"
                },
                {
                    "name": "name_b",
                    "value": "value_b"
                }
            ]
        }
    }
}