daikin ha rezi de haratte kudasai.

払ってください is made from:

• 払う = to pay
• 払って = the て-form of 払う
• ください = please do ...

So 払ってください means please pay.

This is a very common polite pattern in Japanese:

• Vて + ください = please do V

Examples:

• 待ってください = please wait
• 見てください = please look
• 書いてください = please write

It is polite and standard, especially in instructions and service situations.

In 代金はレジで払ってください, は marks 代金 as the topic.

So the sentence is not just about paying in general; it is specifically talking about the payment / the charge / the amount due and saying what should be done with it.

A natural way to understand the structure is:

• As for the payment, please pay it at the register.

Using は can also give a slight sense of contrast or topic-setting, as in:

• regarding the payment,
• as for the bill,
• when it comes to payment...

In signs and store instructions, this kind of topic-marking is very common.

代金 specifically means the price, the charge, or the amount owed for something.

By contrast, お金 means money in a general sense.

So:

• お金を払ってください = please pay money
  
  • understandable, but less specific
• 代金を払ってください = please pay the amount due / the charge
  
  • more natural in a shopping or service context

In other words, 代金 refers to the payment that is owed, not just money as a general concept.

レジ means cash register, checkout, or till.

The particle で marks the place where an action happens.

So:

• レジで払ってください = please pay at the register

This is the standard use of で for the location of an action:

• 学校で勉強します = study at school
• 駅で会います = meet at the station
• 店で買います = buy at the store

Here, paying happens at the register, so で is the natural particle.

Because 払う is an action that happens at a place, not movement to a place.

• で = where an action takes place
• に = destination, existence, specific target in some cases

So:

• レジで払ってください = please pay at the register
  
  • correct and natural

If you used に, it would sound unnatural here because the sentence is not focusing on going to the register, but on the location of the act of payment.

Yes, 代金を払ってください is also grammatically correct.

In fact, with 払う, you often see:

• お金を払う
• 代金を払う
• 料金を払う

But in this sentence, 代金は is used instead of 代金を because 代金 is being presented as the topic.

Compare:

• 代金をレジで払ってください
  = Please pay the charge at the register.

  • straightforward object marking

• 代金はレジで払ってください
  = As for the payment, please pay it at the register.

  • topic-focused, common in instructions

So nothing is missing by mistake; the sentence is just using は instead of を for a different grammatical focus.

Yes. Japanese often leaves out things that are understood from context.

In this sentence, the listener is understood to be you, and the object of payment is already clear from the situation.

A fuller English-like version would be something like:

• Please pay the amount due at the register.

But Japanese does not need to explicitly say things like:

• you
• it
• here
• for this item

if the context already makes them obvious.

This kind of omission is very normal in Japanese.

It is an instruction, but a polite one.

払ってください is softer than a plain command like:

• 払え = Pay!
  
  • very direct, rough, and usually not appropriate in normal service situations

So 払ってください is better understood as:

• please pay
• please make your payment

In a store, on a sign, or from staff to a customer, this sounds normal and polite.

The reading is:

だいきん は レジ で はらって ください。

Breakdown:

• 代金 → だいきん
• は → は (pronounced wa as a particle)
• レジ → レジ
• で → で
• 払って → はらって
• ください → ください

A useful point: the particle は is written は but pronounced wa in this kind of sentence.

This sentence is typical in places like:

• stores
• restaurants
• service counters
• checkout areas
• signs telling customers where to pay

It sounds like a practical instruction: the goods or service may be handled in one place, but payment should be made at the register.

For example, it may imply:

• don’t pay here
• pay at the checkout counter
• payment is handled separately

So the nuance is not only please pay, but also the proper place to pay is the register.

The spaces are just for learner readability.

Normal Japanese writing usually does not put spaces between words:

• 代金はレジで払ってください。

Japanese is normally written continuously, and readers understand the word boundaries from grammar, kanji, and context.

In textbooks or beginner materials, spaces are often added to make the structure easier to see.

Yes. A few natural alternatives are:

• 代金をレジで払ってください。
  More directly marks 代金 as the object.

• お会計はレジでお願いします。
  Very common in customer-service language; softer and more indirect.

• レジでお支払いください。
  Very common on signs and in formal service language.

Each version is slightly different in tone, but they all fit the same general situation. The original sentence is clear, polite, and natural.