Case-ID: 6394971 Hi Apple Team, We are trying to implement “onvalidatemerchant” event, but we are facing below error. “System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host” below is the sample code what we trying. string validationUrl = https://apple-pay-gateway.apple.com/paymentservices/startSession; var sessionRequestBody = new ApplePaySessionRequest { merchantIdentifier = "merchant.com.onepay.onepaygo", displayName = "Apple Pay OnePay", Initiative = "web", initiativeContext = "portaldev.onepay.com" }; We are also added the merchant certificate. We have also tried other url: string validationUrl = https://apple-pay-gateway-cert.apple.com/paymentservices/startSession. Let me know if you need any other info.