Retail_manager/RMWPFInterfaceLibrary/Api/IAPIHelper.cs

using RMWPFUserInterface.Models;
using System.Threading.Tasks;

namespace RMWPFInterfaceLibrary.Api
{
    public interface IAPIHelper
    {
        Task<AuthenticatedUser> Authenticate(string username, string password);
        Task GetLogedInUserInfo(string token);
    }
}