How to redeem the card
In order to redeem the card you need to create a Japanese PSN-account!
1. Got to the Japanese PSN-Store.
2. Select the content you want to purchase.
3. Add the content to your shopping card by clicking カートに入れる.
4. Continue by clicking 購入手続きへ進む.
5. Confirm by clicking 購入手続き.
6. Select ウォレットへチャージ（入金）
7. Select コード番号
8. Enter the 12-character code and confirm with 次へ.
9. Your PSN-wallet is now charged.
For additional guides to go to https://support.jp.playstation.com/app/answers/detail/a_id/502