Check Out flow:

• Select products you want to buy.
• Click on Cart icon; which ask you to Sign In if not already logged in; with option for Sign Up for new user.
• After Sign In, user redirected to Shopping cart.
• Verify the items in cart, adjust the quantity and press Proceed to Check Out buttons.
• Enter the Address/Contact Information and click on Check Availability button.
• If Check Availability get success response then you are able to click on Checkout button and Select Payment method, complete payment.