 Complete the following phrase:  In order to enter the FIA GT World Cup in Macau, drivers had to compete in a Fédération Internationale de lAutomobile FIA-regulated championship race based on GT3 regulations in the previous two seasons or had a vast amount of experience in Grand Touring cars. Manufacturers were permitted to enter up to two drivers through themselves and were limited to platinum ranked drivers; gold rated entrants could only compete with privateers. Bronze and silver rated entrants were eligible on a case by case basis at the FIA GT World Cup Committees digression. The races entry list was released on 6 October. There were 23 drivers from categories such as the Blancpain Endurance Series, the FIA World Endurance Championship, the GT Asia Series, the Deutsche Tourenwagen Masters DTM, Super GT and the Porsche Carrera Cup featured in the final entry list. It included drivers such as the 2015 winner Maro Engel, 