# My payment failed or I cannot complete the purchase

> Most failed purchases are caused by parental controls, a store account from another country or an unsupported payment method. The website checkout is a reliable alternative.

If the purchase stops with an error or nothing happens after you confirm, work through these checks.

## On an iPhone or iPad

- **Ask to Buy** is on for many family accounts. The purchase waits until a parent approves it in their own device. A parent can also buy directly on our website while the child is signed in.
- Make sure a valid payment method is saved in **Settings**, your name, **Payment & Shipping**.
- The App Store country must match your card and address.
- Restart the app and try again.

## On Android

- **Family Link** or parental controls can block purchases. A parent must approve them, or buy on the website instead.
- The Google Play country must match your card. A region mismatch is the most common reason a card is declined.
- Check the payment method in the Play Store under **Payments and subscriptions**.
- Clear the Play Store cache, restart the device and try again.

## On the website

- Try another browser or a private window. Blocked cookies and ad blockers can stop the checkout from loading.
- Check the card details, expiry date and the 3-D Secure confirmation from your bank.
- The checkout only offers the payment methods shown on the payment page. Local methods such as BLIK are not available.

## Buy on the website instead

If a store purchase keeps failing, sign in on [knowunity.com](https://knowunity.com) with the same account you use in the app and buy there. Pro activates on your account and works in the app as well.

## Was money taken anyway?

If your bank shows a charge but Pro is not active, see *I paid for Pro but it is not active*. If the charge should not have happened, see *How do I request a refund?*

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Source: https://knowunity.com/help/subscriptions-and-billing/my-payment-failed-or-i-cannot-complete-the-purchase
Last updated: 2026-10-09