You need to donate 20 000p for the first souvenir, 70 000p for the second souvenir and 200 000p for the third souvenir.
Be aware that the 20 000p has to be in three or more separate donations (for example you could do 5 000p, then 5 000p then 10 000p). If you donate it all at once you might not get the password instantly (if this happens donate two Gotchi Points in two separate donations- 1p then 1p.