[payment-checkout] shortcode is a container for other payment elements and should only be used on the checkout page of your site. It does most of the work of submitting a payment using the details collected by the child elements.
Here is an example of this shortcode. Note that it may have any content inside of it that you choose.
[payments-checkout] [payments-cart] [payments-link-authenticattion] [payments-payment] [paypments-checkout-button] [/payments-checkout]