apim-grid-notification.xml

<when condition="@(context.Variables.GetValueOrDefault<bool>("isEventGridNotification"))">
    <send-one-way-request mode="new">
        <set-url>https://hooks.slack.com/services/{{slack-key}}</set-url>
        <set-method>POST</set-method>
        <set-body>@{  
            var events = context.Request.Body.As<string>(); 
            JArray a = JArray.Parse(events);
            var eventGridData = a.First["data"];
            var station = eventGridData["station"];
            var artist = eventGridData["artist"];
            var song = eventGridData["song"];
            return new JObject(  
                new JProperty("username", station),  
                new JProperty("icon_emoji", ":musical_note:"),  
                new JProperty("text", String.Format("Just added: {0}, {1}",
                    song, artist))
                ).ToString();   
        }</set-body>
    </send-one-way-request>
    <return-response>
        <set-status code="200" reason="OK" />
    </return-response>    
</when>