This is the 2611th most frequent Turkish word.
taksit
"Installment" (a partial payment of a total amount, usually made at regular intervals).
Here, 'taksitli' modifies the payment method indicating multiple installment payments.
Yeni aldığım telefonu taksitli ödeyeceğim.
I will pay for the new phone in installments.
In this sentence, 'taksitlerini' refers to the specific installments linked to a purchase made with a credit card.
Dün kredi kartıyla yaptığım alışverişin taksitlerini kontrol ettim.
I checked the installments of the shopping I did yesterday with the credit card.
The term 'taksit seçeneği' indicates whether an installment payment feature is available.