Use the order confirmation email from Shopify—search your inbox for your order number. You can also create an account or sign in with the same email you used at checkout so future visits are simpler. We highly recommend creating an account, so you have easy access to My Art Gallery. This is an at-a-glance way to see all the artwork you've created and past purchases.
For order-specific help, email hello@ephe.art with any details you remember (date, email, product).