The phrase "checkout procedure" refers to the step-by-step process you go through when you are finishing your purchase at a store or an online shopping website. Full definition
Early Check out: If you need to checkout before 8:30 am you can organise an early checkout procedure at reception before the day of checkout. (backofchapel.com)
Make an investment in secure checkout procedures, and prominently place the logos of your security partners on the page to assure customers that you take the protection of their personal information seriously. (entrepreneur.com)
With this setup, there was no reason to separate them into different rooms based on checkout procedures. (courtneymilan.com)