The following types of promotion discounts are supported:

      • Buy 1 of X for Z% off
      • Buy 1 of X for $Z off
      • Buy 1 of X, Get 2nd X at Z% off
      • Buy 1 of X, Get 2nd X at $Z off
      • Buy 1 of X, Get 2nd X Free
      • Buy 1 of X, Get Y Free
      • Buy n of X, Get Y Free
      • Buy X, Get Y for $Z
      • Buy n of X, Get the (n+1) X free
      • Buy X, Get 2nd X for $Z
      • Buy n of X, Get Y at Z% off
      • Buy n of X, Get Y at $Z off
      • Buy n of X, Get Y for $Z
      • Buy $n or more of X, Get item Y at Z% off
      • Buy $n or more of X, Get item Y at $Z off
      • Buy $n or more of X, Get item Y for $Z
      • Order-level discount: buy X for $Z (exclusive only)
      • Order-level discount: Z% off X (exclusive only)
      • Order-level discount: $Z off X (exclusive only)