OpenSea supports in-product notifications for sales and purchases.
You’ll receive a notification when you:
Buy an item or multiple items
Sell an item or multiple items
Receive a Shipment
When a Drop begins minting, if you've signed up for an email reminder
You can see your notifications next to your wallet and XP balance at the top of the page.
At this time, it isn’t possible to adjust your in-product notification settings. However, you can manage your email notification settings.