As well as offering thousands of free apps, the iTunes app store also offers plenty of paid-for apps that are priced from 69p upwards. We've already shown you how to download and install a free app on an iPhone or iPad.  But to download a paid-for app, you'll need to register your credit or debit card with iTunes first. Here's how to register your payment details ensuring you can purchase an app.

Step one
Start by launching iTunes on your PC. If you already have an Apple ID, you'll need to press Sign in, in the top left-hand corner and enter your log-in details. Alternatively if you have yet to set-up an Apple ID, press Sign in and then Create new account.

Step two
From the drop down menu at the top right-hand corner of the screen accessed by clicking your Apple ID, select Account. Under Payment Information it will say No Credit card on file. Select Edit, which is located to the right-hand side of this.

Step three
Choose from the payment methods you want to register with your account, these include Mastercard and Maestro. Next you'll have to enter the card number, expiry date and three-digit security code, followed by your address. Now press Done. Unlike Google Wallet, there is no option to enter multiple card details.

Step four
You can change payment the details of the card registered to your iTunes account on an Apple iPad or iPhone, by opening the Settings app and then pressing Store. Scroll down to the bottom of the window and click on your Apple ID, then press View ID and tap on your credit card details so change them. You're now free to purchase apps.