(Bloomberg) — Alibaba Group Holding Ltd. will finally let shoppers check out via Tencent Holdings Ltd.’s WeChat Pay, eradicating one of the biggest barriers between the Chinese tech leaders’ competing online ecosystems.Most Read from BloombergHow Air Conditioning Took Over the American OfficeHong Kong’s Arts Hub Turns to Selling Land to Stay AfloatThe Taobao and Tmall shopping platforms will allow its hundreds of millions of shoppers to select WeChat Pay — by far China’s most popular online payRead More