Updates the status of an order/reservation payment line.
Adds to the line nLine of the order id the amount paymentAmount as paid.
An order can be placed without having completed the full amount of payment and modify the status of the payment lines as they are completed.
Once completed, by invoking the method, commit confirmation of the order is done and thus the customer consolidates the benefits related to that order.
This is used when the business allows deferred payment methods as a bank transfer, leaving the order in the state PaymentPending.
In this case, the user confirms the order, but the benefits associated with it
will only be available when the payment is finally confirmed, through updating the corresponding payment line.