The core interface for defining an service for retrieving Entities from a WebAPI

IEntityService.cs

using RecordKeeper.Portable.Models;
using System.Collections.Generic;
using System.Net;
using System.Threading.Tasks;

namespace PortableClient.WebApi.Dal.Interfaces
{
    public interface IEntityService<TEntity> where TEntity : EntityBase
    {
        Task<IEnumerable<TEntity>> Get(ICredentials credentials = null);

        Task<TEntity> Get(string id, ICredentials credentials = null);

        void Update(TEntity entity, ICredentials credentials = null);
    }
}