When kids open their next birthday cards, they may not find a tenner from their grandmother in there but rather they’ll get a notification on their smartphone that money has been deposited in their accounts. A new subset of fintech that’s building services for minors and their parents is gathering steam in an increasingly cashless world. Lately An Post has been heavily advertising its new Money Mate product, which is part of its financial services division. The current account and accompanying debit card and smartphone app are aimed at kids and teens between the ages of seven and 15. Debbie…