Nop 4.3 - Preinstalled Version Package only, no source
I have searched the forums and Googled the problem but I am not sure how to proceed.
The error shows InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead. when the Instant Payment Notifications (IPN) calls my site back to confirm the payment, the error is captured.
I found this article which explains how to modify the startup.cs
and this forum post
I am not a developer and I do not see how to edit the startup.cs in the installed version.
Can anyone help? Is there a forum post that I have missed?
Thank you in advance