My transfer was successful, why can't I see my transaction reflected in my account?

To be sure your transfer was successful, head to the banking app of the account you made the payment from.  

Zopa displays your transactions through open banking. This means the data might be slightly out of date, or your connection might have expired. If your connection has expired, you can renew it in the app by tapping on the profile icon in the top left corner and selecting the ‘Linked accounts’ option.