Andrew Aude, a computer science student at Stanford, used IOS app exploration developer tool Cycript to turn on the feature. The new feature in Messenger will allow users to add a debit card in Messenger, or use the one they've already linked to their Facebook account in the past.
Facebook hasn't turned on the feature yet, but has already built in security measures that will be required for secure in-app payments. The payment feature has propped up soon after David Marcus, former President of PayPal, took over as head of Messenger at the social network giant.
It isn't clear if Facebook will charge users a fee in order to transfer funds to their friends, or will use it as a way to draw in more users for its Messenger service. CEO Mark Zuckerberg urged investors to revise their revenue models during the company's Q2 earnings call, saying that the payments feature was going to be right over multiple years, and may not have any immediate impact on Facebook's earnings.
However, it's now clear why Marcus is at Facebook, and that the company is looking to take on apps like Venmo, PayPal, Square Cash and other peer-to-peer money transfer apps. The company believes that the payments feature will help make Messenger successful, helping people share with each other and interact with businesses.