I try to make integration with PayPal on my Asp.net web store.

I use directpayment method.

When we testing it on local machine we receive approves or decline transaction from PayPal.
When we create analog transaction on windows web hosting (Godaddy) we receive System.Security.SecurityException: That assembly does not allow partially trusted callers.
For integration we use paypal_base.dll and log4net.dll.

How can I understand that it dlls meets the requirement Trusted level - medium?

I have a contact with Godaddy support.

They answer is: Based on the information provided, it would appear that your integration scripts are setup to use a function that requires "Partial Trust" permissions to be enabled on the hosting account. Unfortunately, our Windows shared hosting services will only support "Medium Trust" level permissions and cannot be modified to another permission level.