Click into some of China's most popular apps these days and you'll soon be drowning in ads for loans.
Caixin
In depth: Want a loan? China's tech giants are at your service
Huge troves of user data prove invaluable for insurance, healthcare and other services
Alipay and WeChat Pay have built up an unassailable lead in the third-party payments sector and control more than 90% of the market. © Reuters
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