The Subscribe UDR is sent to the AMQP agent to initiate a subscription or to check if a queue exists. If the subscription operation is successful, the agent will route a SubscriptionOk UDR to the workflow. If the operation fails the agent will send an Error UDR. The following fields are included in the Subscribe UDR:

Field	Description
`declareQueue (boolean)`	When this field is set to true, the queue will be created, if it does not already exist. When this field is set to `false` and the queue does not exist, the subscription will fail. If the operation is successful, the `isSubscribed` field in the corresponding `SubscriptionOk` UDR will be set to `true`.
`passive (boolean)`	Use this field to check if a queue exists without subscribing. If the operation is successful, the `isSubscribed` field in the corresponding `SubscriptionOk` UDR will be set to `false`.
`queueName (string)`	This field contains the name of the queue in string format.
`tagName (string)`	This field contains the tag name in string format.

Next:

9.5.2.10 SubscribeOk UDR

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