link.xml

<linker>
    <!-- Json.NET Compatibility -->
    <!-- 
    These are required for Json.NET and the VREM API to work in IL2CPP
    because IL2CPP strips certain code which causes JSON serialization to fail.
    The "netstandard2.0" version of Newtonsoft.Json must be used!
    -->
    <assembly fullname="RestSharp.Vrem">
        <type fullname="*" preserve="all"/>
    </assembly>
    <assembly fullname="Newtonsoft.Json">
        <type fullname="*" preserve="all"/>
    </assembly>
    <assembly fullname="JsonSubTypes">
        <type fullname="*" preserve="all"/>
    </assembly>
    <assembly fullname="Ch.Unibas.Dmi.Dbis.Vrem.Client">
        <type fullname="*" preserve="all"/>
    </assembly>
    <assembly fullname="System.Core">
        <type fullname="System.Linq.Expressions.Interpreter.LightLambda" preserve="all"/>
    </assembly>
    <!-- Json.NET Compatibility -->
</linker>