Australia's second-largest lender said customers can apply for the card, called Flex, online or through its mobile banking app, and would be given access to A$1,000 ($748.50) of credit with no interest on purchases and no late payment fees.
The move comes as contactless payments have gained in popularity in recent years, especially among young consumers who are tech savvy and rely on the internet for most of their purchases.
"Consumer research shows that younger Australians are less likely to use a traditional credit card, compared to older generations," Westpac's Chief Executive Consumer and Business Banking, Chris de Bruin said.
Westpac earlier in the year partnered with buy-now-pay-later giant Afterpay Ltd for a banking application that would allow users to deposit their salaries in saving accounts.
($1 = 1.3360 Australian dollars)
(Reporting by Sameer Manekar in Bengaluru; Editing by Anil D'Silva)