Here is a KB article which shows how you can setup an AMQP connection in CAI to consume messages from Azure service bus:
Hope this helps.
If this question is related to Azure EventGrid Topic subscription using Webhook.
1. Create a process
2. In process response/output declare a variable named "validationResponse"
3. Assign "validationResponse" variable value as given below
4. Get the process service url
5. Using the 4'th step Service URL in Azure EventGrid topic subscriber connect with "Webhook" option
6. Once Webhook is up and running, the Informatica process will start getting all the messages
Process checkbox "Allow anonymous access" should be enabled