A bonus code is a text that casinos and betting sites offer their players to be used for special promotions and at specific times. The string of text differs from site to site and game to game, and it expires after some time. Players thus need to make timely use of codes before they expire.
Macau is a special administrative region under the jurisdiction of China, and is a former Portuguese colony. It is among the countries whose economy depends on gambling. Today, Macau beats the likes of Monte Carlo and Las Vegas in terms of revenue. Most of the gamblers flock in from mainland China where gambling is illegal.