INTERFACE {{p}}if_tour_summary PUBLIC.
  TYPES ty_tour_type TYPE c LENGTH 1.
  TYPES ty_status TYPE c LENGTH 1.

  TYPES:
    BEGIN OF ty_booking,
      tour_type TYPE ty_tour_type,
      adults    TYPE i,
      children  TYPE i,
    END OF ty_booking.

  TYPES tt_booking TYPE STANDARD TABLE OF ty_booking WITH EMPTY KEY.

  TYPES:
    BEGIN OF ty_result,
      status        TYPE ty_status,
      total_fee     TYPE p LENGTH 8 DECIMALS 2,
      booking_count TYPE i,
      average_fee   TYPE p LENGTH 8 DECIMALS 2,
    END OF ty_result.

  CONSTANTS:
    BEGIN OF c_status,
      ok             TYPE ty_status VALUE 'O',
      invalid_number TYPE ty_status VALUE 'N',
      unknown_type   TYPE ty_status VALUE 'T',
    END OF c_status.

  METHODS summarize
    IMPORTING it_bookings      TYPE tt_booking
    RETURNING VALUE(rs_result) TYPE ty_result.
ENDINTERFACE.