For weeks now, retailers like Walmart (WMT) and Amazon (AMZN) have been duking it out to capture a larger share of the holiday shopping dollar, and have been especially keen to attract online customers.

So far, Amazon is absolutely trouncing its rivals in the e-commerce department, and the Seattle-based firm is looking to widen its lead in the days leading up to Christmas. That’s why it’s heavily pushing a new referral program that will give customers $5 if they refer friends to its mobile shopping app, according to a report in TechCrunch.

“Amazon has an award-winning shopping app that our customers love. We wanted to help give them a way to share it with an added incentive,” a company reprsentatitive told the online publisher. “So, we introduced a program that provides a $5 incentive for customers to refer a friend or family member to shop with the app.”

TechCrunch explains how to get the deal:

You may have spotted this promo when you launched the Amazon app installed on your phone. There, the ad appears, prompting you to “give your friends $5 to spend at Amazon.” You can either click “Get started” or “No, thanks” to opt out. A checkbox “Don’t show me this again,” will keep the ad from appearing at other times in the future.