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Even if there is a call to unsubcsribe to webhook-notifications that should no longer be in use, we have experienced that some subscriptions set up for testing is just abandoned when testing is done, leving the notifications active - also after the endpoint has stopped working.
Since this actually imposes a problem, we have create a feature for automatically unsubscribe ‘dead’ subscriptions.
We will ofc acknowledge that en endpoint my have temporary issues, and therefore we check several times before actually unsubscribing.
We currently issue a verifcationvalidation-call every 8 hours to each registered endpoint (if two subscriptions uses same endpoint, we only send one message). If an endpoint fails on 3 successive calls, all subscriptions to that endpoint will be automatically unsubscribed - Note this features is controlled by a MPP, and has to be turned on to start unsubscribing.