We just made NIP 47 NWC notifications opt-in. You'll need to go into your NWC connection settings at https://coinos.io/settings/nostr to explicitly turn them on if you want us to continue sending them. NWC notifications are created as nostr events when there are incoming and outgoing payments in your NWC-connected wallet. They're a fairly new feature for us so we don't expect many people will be impacted by this change but, for those who are, sorry for the inconvenience!