APIM Policy to send Data to servicebus managed identity

 <!--

    - Policies are applied in the order they appear.

    - Position <base/> inside a section to inherit policies from the outer scope.

    - Comments within policies are not preserved.

-->

<!-- Add policies as children to the <inbound>, <outbound>, <backend>, and <on-error> elements -->

<policies>

    <!-- Throttle, authorize, validate, cache, or transform the requests -->

    <inbound>

        <base />        

        <authentication-managed-identity resource="https://servicebus.azure.net/" output-token-variable-name="msi-access-token" ignore-error="false" />

        <set-backend-service base-url="https://myservicebus.servicebus.windows.net/" />        

        <rewrite-uri template="salesorder/messages" />

        <set-header name="Content-Type" exists-action="override">

            <value>vnd.microsoft.servicebus.yml</value>

        </set-header>

        <set-header name="Authorization" exists-action="override">

            <value>@("Bearer " + (string)context.Variables["msi-access-token"])</value>

        </set-header>

        <set-body>@{

                JObject json = context.Request.Body.As<JObject>(preserveContent: true);

                return JsonConvert.SerializeObject(json);

            }</set-body>

    </inbound>

    <!-- Control if and how the requests are forwarded to services  -->

    <backend>

        <base />

    </backend>

    <!-- Customize the responses -->

    <outbound>

        <base />

    </outbound>

    <!-- Handle exceptions and customize error responses  -->

    <on-error>

        <base />

    </on-error>

</policies>