Redeemed iTunes Card
I got a $25 iTunes gift card. On September 26, 2019, signed to my account, redeemed the card, and did a $10 dollar purchase, the card was $25 dollars. I should have a remaining $15 dollar balance. I didn't logged again to my account until today, August 15, 2020. To my surprise, my balance is now $0. I thought this never expired. The only monthly subscrition that I have on this account is Netflix. Did iTunes used my balance to pay for that subscription instead of making the charge to my registered credit card? Or do iTunes cards have expiration date once redeemed?
Windows, Windows 6