I don't know what to do more than this
Help please
Here's my code
Public Class challengeResponseOBJ Public Property challengeResponse As String End Class Public Function checkEbayRequestAndReturnResponse(request As HttpRequest) As challengeResponseOBJ Dim method = request.HttpMethod Dim response As String If method = "GET" Then Dim challengeCode = request.QueryString("challenge_code") If String.IsNullOrWhiteSpace(challengeCode) Then Return Nothing Else Dim hash = EbayNotificationCheck(challengeCode) Return New challengeResponseOBJ With {.challengeResponse = hash} End If Else return nothing End If End Function Public Function EbayNotificationCheck(challenge_code As String) As String Dim verificationCode = "<verficationCode>" Dim url As String = "<myUrl>" Dim sha256 As SHA256 = SHA256Managed.Create() Dim stringToEncode = challenge_code + verificationCode + url Dim bytes As Byte() = Encoding.UTF8.GetBytes(stringToEncode) Dim hash As Byte() = sha256.ComputeHash(bytes) Return BitConverter.ToString(hash).Replace("-", String.Empty).ToLower() End Function