What to verify
PlayStation Store voucher codes contain 12 digits; a 10-digit code is a discount code rather than wallet value.
The voucher must match the PlayStation Store account region, and the account region cannot simply be changed for redemption.
Some retail vouchers have no value until activated at the register. Keep the activation receipt.
PlayStation may request purchase date, retailer, proof of purchase, and pictures of both sides.
Official and primary sources
Issuer policies can change. Open the source before making a decision that depends on current redemption or support terms.