Function call

This code below is in a namespace and Interface and functions declared using different data types so will they execute in sequential order or will they need to be called for execution

namespace InTouchCapAutomation
{
    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
    [Guid("69D98FE7-90D6-4597-9476-8EABC68739E5")]
    [ComVisible(true)]
    public interface INAVClient
    {
        bool mobRetrive(string mobno,string userdet);
        string details(int index);
        bool pushdata(string New_Customer, string userdet);
        void additems(string item);
        bool updateCust(string details,string otherDet,string userdet);
        bool AddTransaction(string details,string userdet);
        string CouponFetch(string coupon, string userdet);
        int customdet(int index);
        bool notInterestedTrans(string details, string userdet);
        bool updateDates(string details, DateTime brthdy,DateTime AnvDy, string userdet);
        string VoucherRedeem(string User_Cred, string alldet, string Amt);
        bool points_validation(string mobile, int points, string Usr_det);
        int points_redemption(string OrdId, string Mob, string Val_Code, int points, string user_det);
    }

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