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The designer URL supports profile parameter in order to hide some of the links on the designer screen.

In v11.35.1, OneSpanSign.Sdk.Internal.ApplicationLogger no longer seems to work because the trace compiler constant is missing.
I suspect, but did not validate, this setting went missing during the upgrade to netstandard. The visual studio project type for netstandard doesn't have an obvious way to set this, and it seems to be set by default back in the full .net framework days.

According to Microsoft, there are 2 ways to fix the issue:

1. Adding #define TRACE to OSS SDK code.
2. specifying the option /d:TRACE when compiling OSS SDK code.

I didn't check the code on versions newer than v11.35.1, because those tags aren't available.

In case you're curious what's going on behind the scenes, here is what ApplicationLogger looks like when decompiled, and TRACE is not defined. Notice all the empty methods.

Here is what ApplicationLogger looks like when decompiled, and TRACE is defined. Notice methods arent empty.

Here is the quick and dirty fix I used so I could move forward.

The designer redirect path is wrong in UrlTemplate.

When there are more than one attachment, we cannot download separate attachment files using:

Fix: UrlTemplate.ATTACHMENT_REQUIREMENT_PATH -> UrlTemplate.ATTACHMENT_FILE_PATH

In 11.38, commit c9b3a53, calling EventNotificationService.Register(builder) throws an exception in HttpMethods.WithUserAgent due to setting the 'User-Agent' string as a name/value pair. 11.36 works correctly.

https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.headers#System_Net_HttpWebRequest_Headers contains the list of restricted headers.

OneSpanSign.Sdk.OssException: Unable to configure event notification. Error communicating with oss server. The 'User-Agent' header must be modified using the appropriate property or method.
Parameter name: name ---> OneSpanSign.Sdk.OssException: Error communicating with oss server. The 'User-Agent' header must be modified using the appropriate property or method.
Parameter name: name ---> System.ArgumentException: The 'User-Agent' header must be modified using the appropriate property or method.
Parameter name: name
   at System.Net.WebHeaderCollection.ThrowOnRestrictedHeader(String headerName)
   at System.Net.WebHeaderCollection.Add(String name, String value)
   at OneSpanSign.Sdk.Internal.HttpMethods.WithUserAgent(WebRequest request)
   at OneSpanSign.Sdk.Internal.HttpMethods.PostHttp(String apiKey, String path, Byte[] content, IDictionary`2 headers)
   --- End of inner exception stack trace ---
   at OneSpanSign.Sdk.Internal.HttpMethods.PostHttp(String apiKey, String path, Byte[] content, IDictionary`2 headers)
   at OneSpanSign.Sdk.RestClient.Post(String path, String jsonPayload)
   at OneSpanSign.Sdk.EventNotificationApiClient.Register(Callback callback)
   --- End of inner exception stack trace ---
   at OneSpanSign.Sdk.EventNotificationApiClient.Register(Callback callback)
   at OneSpanSign.Sdk.Services.EventNotificationService.Register(EventNotificationConfig config)
   at OneSpanSign.Sdk.Services.EventNotificationService.Register(EventNotificationConfigBuilder builder)