Hello, AndyFitia. Thank you for posting your question to the Apple Support Communities.
We understand that you have been unable to process purchases in the iTunes Store or App Store recently. We know that making these purchases must be important to you and we’re happy to help you find a solution.
The error message you are seeing could show up for different reasons. We’d like to provide you with several Apple Support articles that contain troubleshooting steps we’d recommend that you try first. Please review the following article:
If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support
If you’re still unable to process the purchase after using these steps, there may be an issue with the payment method that you are attempting to place the order with. This next article explains what you can do if you notice an issue with your payment method being declined:
If your payment method is declined in the App Store or iTunes Store - Apple Support
We hope this information helps you find a solution. Please let us know if you have any other questions.
Cheers!