BERLIN, Germany — Wirecard AG is negotiating with representatives of Alipay, a unit of Chinese e-commerce giant Alibaba, about it taking a stake of up to 25 percent in the German banking software company, a newspaper reported on Sunday.

Without citing its sources, the Bild am Sonntag weekly said Wirecard was in confidential talks with Alipay about it taking a stake of up to 25 percent, and possibly more later. The paper said Wirecard declined to comment.

In December, the two companies agreed to a deal to provide mobile phone payment services for Chinese tourists visiting Europe.

The newspaper said both sides had an interest in the deal: The Chinese want access to German expertise, while Wirecard would like to have a large shareholder, because its share price has come under pressure from short-sellers.

A deal would mark the latest Chinese investment in a German firm after a €4.5 billion takeover bid by China's Midea for German industrial robot maker Kuka.

Alipay counts more than 400 million active users of its payment systems in China, representing an estimated 80 percent of the mobile payments market and 50 percent of the online market in the world's second-largest economy.

Its electronic wallet system is widely used in both retail shops and for online transactions.

By Emma Thomasson.