This is the 14139th most frequent Russian word.
оплатили
"Paid."
The word 'оплатили' is used to express that the action of paying has been completed by the subject (we) for a specific cost (the bill).
Мы оплатили счёт в ресторане.
We paid the bill at the restaurant.
Here, 'оплатили' signifies that the payment for a service (apartment rent) has been completed by the subject (they) ahead of the due time.
Они оплатили аренду квартиры заранее.
They paid the apartment rent in advance.
In this context, 'оплатил' (masculine singular form) states that the subject (I) has completed the transaction for a purchase made online.