Gateway Sample 2

	class marketPlace extends Gateway {
      /* info omitted for convinience */
      audit = {}
   
		marketOne (id) { /* ... */}
      marketTwo (id) { /* ... */}
      marketThree (id, order) { /* ... */}

      exec (command, ...rest) {
        if (this.audit[command]) {
			this.audit[command].push(rest)
		  } else {
        	this.audit[command] = [rest]
        }
        Gateway.prototype.exec(command, rest)
      }
  }