I bought a 50 euro PSN card and rubbed it freely and now I can't recognize a few digits.
Well then send the code, how else can I help you
Better take a look or try the numbers.
Or show a photo.
PS: but you seem to have a lot of problems with PSN - first entered the wrong date of birth, then PS + on the wrong account, now the code is not readable… Pro tip: wait until you are grown up enough 😉
Then you have to try it out. Enter the digits you already have and guess at the rest until you have made it by accident.