# MSMQ Subscription Authorization

<!-- Version variant: msmqtransport_1; default: [/transports/msmq/subscription-authorisation.md](/transports/msmq/subscription-authorisation.md) -->


Subscription authorization allows code-level control over what subscribers can subscribe to or unsubscribe from.

<!-- snippet: SubscriptionAuthorizer -->

```cs
var transport = endpointConfiguration.UseTransport<MsmqTransport>();
transport.SubscriptionAuthorizer(context =>
{
    var headers = context.MessageHeaders;
    var subscriptionMessageType = headers[Headers.SubscriptionMessageType];
    var messageIntent = headers[Headers.MessageIntent];
    var messageIntentEnum = (MessageIntentEnum) Enum.Parse(typeof(MessageIntentEnum), messageIntent, true);
    // messageIntentEnum will be either MessageIntentEnum.Unsubscribe or MessageIntentEnum.Subscribe
    var endpointName = headers[Headers.SubscriberEndpoint]
        .ToLowerInvariant();
    // true to allow false to decline
    return true;
});
```

<!-- endsnippet -->