How a customer can make multiple purchases
Using the Gumroad overlay
If you are using the Gumroad overlay to sell products from your own website, and you link to multiple products at once on the same page, then your customers will see a payment form that automatically bundles your products together. (Note: This is not the same thing as a shopping cart on your site - that is something we're still looking to build out.)
Using your Gumroad profile page
When a customer clicks the buy button of multiple products on your profile, they create a bundle for purchasing.
Their bundle appears in the upper right hand side of the profile page. They only have to enter their credit card or PayPal information once in order to buy everything. Separate receipts for each product will arrive in their inbox soon thereafter, for which they can print separate invoices.