Don't panic, your code isn't lost
If you didn't write down your Woyofal code right after buying it, it's still accessible in the app.
Method 1: the confirmation screen
Right after a successful Woyofal purchase, Kodo shows your 20-digit code on the confirmation screen, with the option to copy it.
Method 2: the Activity tab
If you've already left that screen, open the Activity tab in Kodo, find the Woyofal transaction in question: your code stays viewable there at any time.
Good to know: depending on your operator, Senelec may also send you a confirmation by SMS directly to your line, an extra safeguard independent of Kodo.
If the code still doesn't work
If your meter rejects the code you've found, see What does "Code rejected" or "Error" mean on my Woyofal meter?