I am extending our Commerce dashboard with some extra analytics widgets and was wondering how the repository code is set up for fetching data records.

I am currently writing an extended repository for the purpose of fetching B2B orders (where customers filled in company name).

public class AnalyticsExtensionRepository : IAnalyticsExtensionRepository
{
    public void Dispose() => throw new NotImplementedException();

   public long GetTotalB2bOrders(
        Guid storeId,
        DateTime from,
        DateTime to)
    {
        throw new NotImplementedException();
    }

    public IEnumerable<DateRecord<long>> GetTotalB2bOrdersOverTime(
        Guid storeId,
        DateTime from,
        DateTime to,
        int dtOffsetMins)
    {
        throw new NotImplementedException();
    }
 }

Is it possible to get a look at how the IAnalyticsRepository methods are build? I would like to build my extension methods in the same manner.