You can find all in progress checkouts via the Shopping Cart Manager:

In the Shopping Cart Manager, you'll see all the carts that are in progress or have been recently completed via Shelterluv's credit card processor. For carts that are in progress, you'll see options to "Resend Checkout", "Edit" and "Delete". Resending the checkout will give you the opportunity to resend the link to the adopter's phone. Editing will invalidate the current cart and let you go back to edit what was originally in that cart. Deleting will remove the cart altogether.