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Google(s goog) is hoping to spread the use of Google Apps for Business through word of mouth – aided by a new referral program that pays a $15 bonus per each new user you sign up. The company introduced the program in a post to its Enterprise blog on Monday.

To register for the program, you’ll need to head over to Google and provide your name, email address, taxpayer ID and a bank account at which to receive direct deposits. You’ll receive a unique referral link after registering for the program, and can earn coupons that save your referrals $10 per user for the first year.

According to the fine print, you can refer an unlimited amount of customers, but are only rewarded for each referral’s first 100 users. Referral amounts will be based on the number of users that have paid for at least 120 days.

Right now the referral program is only available to businesses in the U.S. and Canada. Google’s app suite, which includes Calendar, Docs, Drive, Gmail, Sheets and Slides, among other tools and services, is currently used by over 5 million businesses. You can find out more info and sign up here.