Ask the store to delete your conversation and orders, or write to the contact details of the store you bought from with the store's name and your username or phone number. We delete the data within 30 days.
Remove OrderFlow in your Facebook settings (Apps and websites). Meta then tells us to delete the data we received about you, and you get a confirmation code. Stores can also disconnect a channel in Settings → Channels, which deletes its access tokens at once.