There are several possible solutions:
Make sure you've selected the correct car number for which you want to make a payment.
Re-enter bank / credit card details - Menu -> Select payment method.
Secure online shopping is not enabled on your bank / credit card. Contact your bank.
Top up your bank / credit card account if there are insufficient funds.
Mobile operator disruptions - Choose another payment methot, for example bank card or contact your mobile operator.
If the problem persists, contact our customer service center +370 700 77877 or info@unipark.lt