From your Orders page, click View next to the order. Scroll down to the bottom of the order detail page until you see the cost breakdown showing your profit.
Generally, you will be paid the order total minus the lab's printing and shipping costs, and any payment processing fee charged by Stripe or PayPal. If you are on the Free Plan for Client Gallery, a Pixieset commission fee will also be charged. You can learn more about this breakdown here.
Example (Upgraded Client Gallery Plan)
You sell a product at: $100.00
Printing and shipping costs: -$38.00
Payment processing fee (Stripe, PayPal): -$3.20
Pixieset commission: $0.00
Your payout: $58.80.
To learn about how your profit is sent to you, see our article: Getting Paid for your Store Orders