When e-commerce is enabled and you start receiving orders, you will see an option "orders" under the e-commerce menu option 

This will give you a clear picture of all the orders placed, both failed and successful along with the total earning and no. of orders placed. Options available

• Search - Enter order ID, username, or training to search for specific order you want to view.
• Time period - Filter the orders based on transaction dates by clicking on any time range on top.
• You can filter to view only courses or learning paths by clicking on the Training drop-down at the top of the table.
• If you have enabled Shipstation, an additional column "Shipping status" will be added to the table. This will show whether the materials associated with the order have been shipped or not. 
• To view the details of a specific order, click on the order ID.
• You can export the complete order list by clicking on the "Export" button.