"Over a three year period China's gone from being a cash-based society to a cashless society and everyone is paying for everything on their mobile phone," he said.

"WeChat is all encompassing and pervasive. You use when you wake up in the morning, getting to work, buying food, booking a holiday and talking to friends.

"When you come to somewhere like Australia and you can't pay for things you pay for day to day it is a real change.

"Providing the ability for people to transact and make purchases on their mobile phone from the minute they get off the plane and maintain that connectivity when they return to China we think it's going to a game changer."

He said one of the main reasons the Chinese go travelling was to shop and Australian products were at the top of their list.

"When they tell their family and friends they are going to Australia they say, 'well here is my shopping list, I'll transfer the money to you on your mobile wallet'," Mr Carr said.

"They will be able to buy vitamins, supplements, skin care and traditional souvenirs as well like bags, shoes, blankets, that sort of thing. All the things that we know anecdotally are in demand for Chinese buyers."

Perth Airport chief commercial officer Kate Holsgrove said the app would deliver benefits for its retailers looking to diversify their business for the China market.