3PL callback delays are causing customers to inquire about logistics. How can I reduce WISMO tickets?

There are many WISMO (Where Is My Order) tickets in customer service, often not because the warehouse hasn't shipped, but because the 3PL webhook callback is slow. For a while, customers had already received carrier tracking, but the store backend still showed 'unfulfilled,' forcing customer service to manually check the 3PL portal. Seeing that the status wasn't updating, customers kept emailing…