apim-to-grid.xml

<send-one-way-request mode="new">
    <set-url>{{event-grid-topic-endpoint}}</set-url>
    <set-method>POST</set-method>
    <set-header name="aeg-sas-key" exists-action="override">
        <value>{{event-grid-topic-key}}</value>
    </set-header>
    <set-header name="Content-Type" exists-action="override">
        <value>application/json</value>
    </set-header>
    <set-body>@{      

        // Parse the request body
        var requestBody = context.Request.Body.As<string>();
        JObject json = JObject.Parse(requestBody);

        // Add the customer ID, order details and
        // request ID of the API call to the event
        // data property.
        var data = json["order"];                                                
        data["customerId"] = json["customerId"];
        data["requestId"] = context.RequestId;

        // Set the event type based off of the quantity ordered
        var quantity = (int) json["order"]["quantity"];
        var eventType = quantity > 50 ? "Contoso.Orders.Large" : "Contoso.Orders.Normal";

        // Events are sent in an array
        var events = new JArray();

        // Initialize the event and add it to the array
        var newOrderEvent = new JObject();
        newOrderEvent.Add("Data", data);
        newOrderEvent.Add("Subject", "contoso/newOrder");
        newOrderEvent.Add("EventType", eventType);
        newOrderEvent.Add("Id", Guid.NewGuid().ToString());
        newOrderEvent.Add("EventTime", DateTime.UtcNow.ToString());
        events.Add(newOrderEvent);

        // Format to a string and ready to go!
        return events.ToString(Newtonsoft.Json.Formatting.None);   

    }</set-body>
</send-one-way-request>