Australian fintech firm Airwallex said it raised $100 million on Tuesday in an extension of the funding round, maintaining its $5.5 billion valuation.

The Melbourne-based company received additional funding from existing investors, including Tencent Holdings Ltd, Sequoia Capital China and Lone Pine Capital.

Australian industrial pension fund HostPlus and a North American pension fund also participated in the round, Airwallex said.

The company said that with the $100 million raised in the Series E expansion round, Airwallex’s total funding has grown to more than $900 million.

Airwallex, which allows customers to issue and pay international invoices and bills through its payments platform, said its revenue grew 184% yearly and its customer base more than doubled.