We are facing problems while processing test payments from PayPal. We are using the card: 4111111111111111, Feb 2022, 111. We have tried for the different card as well and the problems persist for them also. We have integrated PayPal services for 3-4 domains and everywhere the card is failing and getting a null response from the Paypal end. Is there anyone facing the same issue, if yes, kindly let us know the solution.