I can tell you how to fix it. Ready? Add 1$ to your account through the App Store. Click add money to your account. Only 1$ it will push the pending through.

Update your billing informationYou can update your billing information in Settings on your iPhone, iPad, or iPod touch, or in iTunes on your Mac or PC. When you update your information, use any of these payment methods. You can't select None when you have an unpaid balance or payment due.After you update your billing information, the App Store or iTunes Store automatically attempts to charge any outstanding orders to your updated payment method.Pay an unpaid billOn your iOS device: Go to Settings > [your name] > iTunes & App Store, then tap your Apple ID. Tap View Apple ID and sign in with your Apple ID, then tap Purchase History. (You can also view your purchase history in iTunes on a Mac or PC.)Find the unpaid purchase, which is likely at the top of the list, and tap it, then change your payment method.Add funds to your Apple IDWhen you try to pay an unpaid bill, you might see the option to pay with Apple ID credit if you have a credit balance.If you don’t have a credit balance, you can redeem App Store & iTunes Gift Cards or add funds to your Apple ID2, then use the credit to pay an unpaid bill.

Any purchases already done should show on your purchase history : See your purchase history in the iTunes Store on a Mac or PC - Apple SupportIf you have auto-renewing subscriptions due : View, change, or cancel your subscriptions - Apple SupportAnd/or pre-orders : Pre-order music and movies from the iTunes Store - Apple SupportIf you are a family share organiser check the members accounts as well