If you want to check whether your checkout process and settings for order processing, inventory, shipping, and taxes are properly working, you can place a test order by simulating a transaction on Shopify.

There will be no fee for operating this action that you should practice it at least once during your store setup, or whenever you make adjustments to your payment settings. To know the detailed process, check this post to know how to place a test order by simulating a transaction on Shopify.

https://avada.io/shopify/docs/how-place-test-order-by-simulating-transaction-shopify.html