Walmart has dropped Alipay in favor of WeChat in western China as the two largest mobile payments systems in that country continue to jockey for dominance.

Reuters reported that Walmart switched to WeChat in China's western region based on what the retailer called a "business decision" to improve customer service.

"In the future, Walmart will cooperate with more partners to provide payment solutions with more convenience and benefits," a company spokeswoman told Reuters in an emailed statement.