Breakdown of shiharaikigen o kakuninsuru.

Questions & Answers about shiharaikigen o kakuninsuru.
It is read:
しはらいきげん を かくにんする
- 支払期限 = しはらいきげん
- を = o
- 確認する = かくにんする
A small note: even though を is written with the kana を, in modern Japanese it is pronounced basically the same as お.
支払期限 is a compound noun made of:
- 支払 = payment
- 期限 = deadline / time limit
So together it means payment deadline or payment due date.
You can think of it as one noun phrase:
支払期限 = the payment deadline