Paypal transactions are currently facing issues, we are working to resolve the issue as our top priority.
As soon as the problem is solved, we will announce this.
The cause of the disruption has been identified. Due to changes on the risk check side of PayPal, some merchants may experience issues with transactions and/or refunds. If you still have problems like this, please get directly in contact with PayPal.
There is no technical issue with our integration, but the changes of PayPal can have an effect on some merchants.