daikin wo harau mae ni, seikyuusyo no kingaku wo kakuninsimasu.

When a verb comes before 前に, it normally appears in the dictionary form.

• 払う前に = before paying
• not 払います前に

This is a standard grammar pattern:

• Verb (dictionary form) + 前に = before doing something
• Noun + の + 前に = before something

Examples:

• 食べる前に = before eating
• 寝る前に = before sleeping
• 会議の前に = before the meeting

So 代金を払う前に means before paying the fee/price.

前に means before.

In this sentence, it shows that one action happens earlier than another:

• 請求書の金額を確認します = check the amount on the invoice
• 代金を払う前に = before paying

So the order is:

1. check the invoice amount
2. pay

The に after 前 marks the time point before which something happens.

Because there are two different verbs, and each verb has its own object.

The sentence contains:

1. 代金を払う

   • 代金 = the payment / charge / amount due
   • を marks it as the thing being paid

2. 請求書の金額を確認します

   • 請求書の金額 = the amount on the invoice
   • を marks it as the thing being checked/confirmed

So each を belongs to a different action.

請求書の金額 literally means the invoice’s amount, or more naturally in English, the amount on the invoice.

Here, の links two nouns:

• 請求書 = invoice
• 金額 = amount

So:

• 請求書の金額 = the amount of the invoice / the amount listed on the invoice

This use of の is very common for showing relationships like:

• possession
• description
• category
• location/association

For example:

• 日本の車 = Japanese car / car from Japan
• 学生の本 = the student’s book
• 店の名前 = the store’s name

They are related, but not the same.

• 代金 = the money you pay for something, the charge, the bill amount to be paid
• 金額 = a numerical amount of money, an amount in yen/dollars/etc.

In this sentence:

• 代金を払う = pay the charge / pay the amount due
• 請求書の金額を確認します = check the amount written on the invoice

So 代金 focuses more on the payment itself, while 金額 focuses more on the figure or sum.

Japanese often omits the subject when it is clear from context.

So this sentence does not explicitly say:

• I check
• we check
• you check
• one checks

It simply states the action.

Depending on the situation, it could mean something like:

• I check the invoice amount before paying
• We check the invoice amount before making payment
• Please check the invoice amount before paying

Japanese frequently leaves out subjects if they are understood from context.

Because Japanese sentences usually place the main verb at the end.

The first part, 代金を払う前に, sets up the time condition:

• before paying the fee

Then the main action comes last:

• 請求書の金額を確認します = check the amount on the invoice

A very literal order would be:

• Before paying the fee, the invoice amount check.

That sounds unnatural in English, but it is normal in Japanese.

The comma is not strictly required, but it is very natural and helpful.

It separates the introductory time phrase from the main clause:

• 代金を払う前に、請求書の金額を確認します。

Without the comma, the sentence is still correct:

• 代金を払う前に請求書の金額を確認します。

The comma just makes it easier to read.

Yes, often you can.

• 払う = pay
• 支払う = pay, often a bit more formal or business-like

So in a business context, 支払う前に would also sound very natural.

Comparison:

• 代金を払う前に = before paying the fee
• 代金を支払う前に = before making payment

Both are correct. 支払う may sound slightly more formal.

Because 確認します means more than just look at. It means check, verify, or confirm.

• 見ます = look at, see
• 確認します = confirm/check carefully

In a billing or invoice context, 確認します is much more appropriate because the idea is to verify that the amount is correct before paying.

So:

• 請求書の金額を見ます = I look at the amount on the invoice
• 請求書の金額を確認します = I check/confirm the amount on the invoice

The sentence you have is in polite form because of 確認します.

The plain-form version is:

• 代金を払う前に、請求書の金額を確認する。

Only the final verb changes:

• 確認します → polite
• 確認する → plain

Notice that 払う does not change, because it is already in the dictionary form required before 前に.

Here are the common readings:

• 代金 = だいきん
• を = pronounced お
• 払う = はらう
• 前に = まえに
• 請求書 = せいきゅうしょ
• 金額 = きんがく
• 確認します = かくにんします

Full reading:

• だいきん を はらう まえに、せいきゅうしょ の きんがく を かくにんします。

No. In normal Japanese writing, this sentence would usually be written without spaces:

• 代金を払う前に、請求書の金額を確認します。

Spaces are often added in learning materials to make the sentence easier to read, but standard Japanese normally does not separate words with spaces.