Default status of a payment: When an order placed, the status of payment is
set to this variable. By default it is set to Payment pendingRule for all payment methods: Own calculation code (valid PHP source code!)
for all payment methods. It is carried out after the rule for the selected payment
and shipping method.
Which selection has priority: If you use the table for linking payment and
shipping methods you can decide which selection should have priority in the order
process. If, for instance, you would like to offer all payment methods and hide
some shipping methods in conjunction with this, then select the Payment method
option. In the opposite case, the Shipping method has priority over the payment method.