INTERFACE {{p}}if_loyalty_rules PUBLIC.
  TYPES ty_points TYPE i.
  TYPES ty_tier TYPE c LENGTH 1.

  CONSTANTS:
    BEGIN OF c_tier,
      basic    TYPE ty_tier VALUE 'B',
      silver   TYPE ty_tier VALUE 'S',
      gold     TYPE ty_tier VALUE 'G',
      platinum TYPE ty_tier VALUE 'P',
    END OF c_tier.

  METHODS get_tier
    IMPORTING iv_points      TYPE ty_points
    RETURNING VALUE(rv_tier) TYPE ty_tier.

  METHODS get_discount
    IMPORTING iv_tier           TYPE ty_tier
    RETURNING VALUE(rv_percent) TYPE i.

  METHODS points_to_next_tier
    IMPORTING iv_points        TYPE ty_points
    RETURNING VALUE(rv_points) TYPE i.
ENDINTERFACE.