This is the 14138th most frequent Russian word.
оплатил
"Оплатил" means "paid."
The word 'оплатил' indicates that the subject settled the payment for a specific bill.
Я оплатил счет за коммунальные услуги.
I paid the utilities bill.
'Оплатил' here is used to denote the action of completing a payment for a transaction made online.
Он оплатил заказ в интернет-магазине.
He paid for the order in the online store.
The usage of 'оплатила' signifies that the subject paid the entire cost of tuition for university education.