Hyde here from Shopify.
Webhooks are a tool for retrieving and storing data from a certain event (more on this here). Sometimes a webhook might fail because there has been too long a time delay in the exchange of data. Why? Well -
So the question is: have you added a third-party app to your store recently? Or have you made any conspicuous code edits at all?
I look forward to hearing from you!
All the best, Hyde.