Some businesses cover the cost of Pay By Group for their customers, thereby making it free for you to use! If they do not, Pay By Group charges a fee of $2.50 to each customer that participates in a group. Some businesses that use Pay By Group have different fee structures than this one, however.
Pay By Group will always display the specific fee structure for any given purchase when group members sign up to pay their share. This is displayed on the right side of the screen when you sign up. If there’s no mention of a fee, then the business is covering it for you.