When you sell a print we automatically email you a notification, this email shows you the image, size, and quantity that you sold. To check your collective sales over any period and see your upcoming payment go to the Sales tab in your seller dashboard.
Artists who have accrued $20 or more are paid on the 15th of each month (for orders that have shipped to the customer). Simply link your PayPal account in the Settings tab of your seller dashboard and your payment is sent automatically once a month.
If you don't currently have a PayPal account, you can sign up for one here.