Added an additional function for selecting a payment method on the checkout page.

Added an additional function for selecting a payment method on the checkout page. The function differs in that it allows you to select a payment method before placing an order, as well as add a description for the buyer.

Added an additional function for selecting a payment method on the checkout page.

Added automatic update of the exchange rate.
Added a function to display the values selected in the search filter at the top of the page.
Added "Payment returned" status, as well as automatic fixation when a payment is returned through the Fondy Payment System.