LPT paid via salary - can I pay remainder of this years in full now?

Hi
In the process of selling my property and currently paying LPT by salary. Solicitor has mentioned that this needs to be paid in full (apparently purchaser will reimburse some amount later) .

What's the best way to arrange this? Phone Revenue directly or can I do this on line? Do I need to notify my payroll department?

Any info appreciated. Thanks !

I did this online a few months ago, I don't have access now to see the exact details but I think it was just a matter of changing the payment method.

When I sold a couple of years ago, my solicitor paid the amount due out of the proceeds of the sale
I was paying by monthly direct debit at the time