PS + voucher Where is the 12-digit code?

I bought a PS + voucher in the store. There's no code on the voucher itself. The receipt says PSN code and then there are 9 digits. But I can't enter this code, I need 12 digits?! Where is the correct code or my missing three characters?

On the back there's a silver strip that can be rubbed off with a coin bin 13 and zock also ps4

The code is always on the voucher, if you turn it, you can rub it off at the bottom. But be careful not to damage the code underneath.

2FD5_8ENHP63H

Psn codes