Perhaps, sometime when you tried to install or update a free application, you had a message "Required verification", which does not allow this.
The complete message looks like this: "Verification is required - To view payment details, click" Continue "and log in." If the error occurs too often and hinders you, it needs to be fixed. This is done in different ways, depending on your version of iOS.

For what reason does this error occur?

The "Check Requirement" error occurs because of the payment method using the Apple ID, which is tied to the device. Usually, it appears when you can not make a payment if your account has an unpaid invoice or if the device has never been purchased using the device. Accordingly, in order to get rid of it, you need to change the payment method to the current one or even disable all payment options. Below about this in more detail.

How to fix the "Verification required" error

If you do not want to add another cash card to the Apple ID, you need to change the Apple ID settings to get rid of the "Verification Required" error.
  1. Go to Settings.
  2. Select "iTunes Store and App Store", then click on "Apple ID: your@email.com" at the top of the screen.
  3. Select "View Apple ID".
  4. Then choose "Payment Information".
  5. In the "Payment method" section, select "No" or add a new card.
  6. Click "Finish" and close the Settings.
This method should completely solve the problem with the "Verification required" error when trying to download applications.