Klarna (KLAR) will be available for use on Flix transportation in 21 markets, adding the UK, Germany, Italy, France, Poland, Switzerland, Austria, Spain and others to its existing presence in the US and Sweden, the companies said Wednesday.

The company will now be included into the Flix booking platform, giving its bus passengers three new ways to pay -- in full at time of booking, interest-free installments, or through longer-term financing, the companies said.