I didn’t authorize this purchase

This is unfortunately a long list of things to check but you have provided too little information for us to propose a specific solution. When you start your first post describe what happens when you try to download, and the exact wording of any error messages. This would greatly aid us in helping you, and keeping this list shorter and more directed. In the meantime review these suggestions and documents if you think they apply:

Read this article to make sure you know how to download apps and games on your iPhone or iPad

Download apps and games on your iPhone or iPad - Apple Support

Read this document if you can’t download or update apps on your iPhone or iPad --> If you can’t download or update apps on your iPhone or iPad - Apple Support

If the first 5 don't help, use the 6th.

If you see a message that says "Your account has been disabled in the App Store and iTunes", follow the directions in this document --> If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

If a feature on your device is not working, it may have been disabled. See how to 'Use Screen Time on an iPhone, iPad, or iPod touch' by clicking here --> Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support Go to: Content & Privacy Restrictions > iTunes & App Store Purchases and allow adding and deleting apps.

Learn what to do if you can't redownload an item or if you don't see the item in your purchases.

If there's an issue when you redownload apps, movies, or other content from Apple - Apple Support

- Items bought with another Apple ID, and about Family Sharing.

- Incompatible apps.

- Hidden items.

Other considerations:

Do you have the requisite system version for the app you are trying to download?

Do you have the same problem when using a different Wi-Fi network?

Does restarting your device make any change?

Can you download apps normally on another device?

Did you try restarting your device?

Resolve issues between iTunes and third-party security software - Resolve issues between iCloud for Windows or iTunes and third-party security software - Apple Support - You can’t connect to iTunes Store to buy or download content.

Have you entered a payment method? This document explains how to add a payment method to your Apple ID' on an Apple mobile device, a Mac, or a PC; click here --> Add a payment method to your Apple ID - Apple Support

Check Apple's system status to see if a server is having problems --> Apple - Support - System Status

If you can't connect or sign in to iCloud, see if this document has a solution --> If you can't connect or sign in to iCloud - Apple Support

If you can't connect to the App Store, iTunes Store, or Apple Books, read this support article --> If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support

- If none of the suggestions work, try the last one: "If you’ve tried all of the above steps and you still can’t connect, contact Apple Support."

Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> https://support.apple.com/HT201232

What purchase?

Why can't you download Apps?

iTunes & App Store purchases cannot happen on their own. You must have done something to prompt the charge. Either you downloaded an App that had a free trial and you never cancelled it (those normally renew into paid subscriptions), you tried to download an app that had a price to download, or you started an in-app purchase.

You had to initiate the purchase process for a charge to actually happen, even if you somehow did so inadvertently.

In any case, you are now responsible for that payment. Once it is completed successfully you can request a refund.

Until it does complete successfully however your account will be in bad standing, and you will not be able to make use of the iTunes and App Store services which includes downloading free apps and updating existing apps.

click here ➜ Request a refund for apps or content that you bought from Apple - Apple Support