Updating package from 1.9.4 to 2.0.2 breaks the code

[Major-Mike]

When we update the project from version 1.9.4 of the package to the 2.0.2 version, a lot of things break and I cannot find any reference to breaking changes that would cause this and wanted to know if anyone can explain what's going on and how to prevent this from happening.

Obviously the assembly references are there as are the proper using statements. As I stated, the code works fine with the older version and the moment you update, everything being the same, it breaks. Any assist would be appreciated as it is difficult to find any documentation that would explain this.

[JamalAPI]

May you are using deprecated methods. If not, remove the old references and add them again.

See https://github.com/AuthorizeNet/sdk-dotnet/releases.

[Major-Mike]

Ok, your statement can be logical but to have that happen going up a minor version (yes I know 1 to 2 is not minor) but (.9 to 1.0) is and it shouldn't normally be enough to deprecate anything. But let's assume it has, where are the list of deprecated method, aka the breakage list? The releases pages has nothing that would explain this, so linking that is superfluous. Thanks.

This would be more useful, https://github.com/AuthorizeNet/sdk-dotnet/blob/master/MIGRATING.md, hopefully they have something looking through it.