@lukasz We currently make use of Zuora's standard callout notifications for different events (new subscriptions, etc) to notify a custom web service we have about the change. In addition to that we have an integration that runs in Salesforce but updates custom fields in Zuora on Account records related to past due payments. When we update those custom fields, we need that same webservice callout to occur. We have been making that webservice callout from our Salesforce integration but its a more logical flow to have Zuora make that callout. Unfortunately it has never been possibly to trigger the standard Zuora callouts for custom field changes.
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