Personally, I think they could use Ebates in USA / Europe and maybe Rakuten in Asia. Or something like that.
Rakuten is a huge and expanding company with a yearly revenue of about 10 billion dollars. It is often referred to as "the Amazon of Japan".
According to Wikipedia:
Rakuten, Inc. (楽天株式会社 Rakuten Kabushiki-gaisha) is a Japanese electronic commerce and Internet company based in Tokyo and founded in 1997 by Hiroshi Mikitani. Its B2B2C e-commerce platform Rakuten Ichiba is the largest e-commerce site in Japan and among the world's largest by sales. The company operates Japan's biggest Internet bank and number one credit card company (by transaction value). It also offers e-commerce, fintech, digital content and communications services to over one billion members around the world, and operates in 29 countries and regions.