1.
See the following Apple articles:
Manage App Store purchases, subscriptions, settings, and restrictions on iPad
Manage App Store purchases, subscriptions, settings, and restrictions on iPad – Apple Support (UK)
Prevent in-app purchases from the App Store
Prevent in-app purchases from the App Store – Apple Support (UK)
2.
If you can't make purchases or update apps, including free apps, you need to update your payment method or add a new one.
See the following Apple articles:
Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
Add money to your Apple ID balance
Add money to your Apple Account balance – Apple Support (UK)
If you update your payment method or add funds to your Apple ID balance, It would take about 1 to 3 business days in order to process.
If you're still unable to update your payment method, Contact Apple Support.
Click here for more support and assistance.
3.
You need to have a good Service & Wi-Fi.
If they are On, turn Off Hotspot & VPN.