I want to delay shipment notification to my customers until their package hits the USPS mail stream. The documentation at https://help.shipstation.com/hc/en-us/articles/206638577#auto
says that if I use a supported carrier, "you'll be able to set up Delayed Shipment Notifications based on when the shipment first hits the mailstream". Customer support, however, says that this doesn't work unless marketplace notification is also happening. I don't see why one has anything to do with the other - my carrier is USPS/stamps.com and SS is talking to it. My marketplace is Paypal and I don't really care if it's updated or not.