Do zwrotu pieniędzy sklep użyje tego samego środka płatniczego.

Do zwrotu pieniędzy literally means for the refund of the money or for making the refund.

In formal Polish, do + genitive can be used to show purpose or intended use. So here it sets the context before the main clause: when the store makes the refund, it will use the same payment method.

This is a fairly official or legal style. A more everyday wording might be:

• Przy zwrocie pieniędzy...
• Sklep zwróci pieniądze...

Because pieniędzy is the genitive plural form of pieniądze.

The noun zwrot often takes another noun in the genitive, like return of something:

• zwrot towaru = return of the goods/item
• zwrot kosztów = reimbursement of costs
• zwrot pieniędzy = refund / return of money

So pieniędzy is not there because of do directly; it is there because it depends on zwrot.

Użyje is the 3rd person singular form of the verb użyć, meaning to use.

Important point: użyć is a perfective verb. In Polish, present-tense forms of perfective verbs usually have future meaning. So użyje means:

• he/she/it will use

Here the subject is sklep, so:

• sklep użyje = the store will use

That is why there is no separate future auxiliary like będzie.

Because the verb użyć requires the genitive case for its object.

So:

• użyć kogo? czego? = to use whom? what? in genitive

The basic nominative form is:

• ten sam środek płatniczy = the same means of payment

But after użyje, it changes to genitive:

• tego samego środka płatniczego

All the words in that noun phrase agree with each other:

• tego — genitive singular masculine
• samego — genitive singular masculine
• środka — genitive singular
• płatniczego — genitive singular masculine

That is just how Polish expresses the same: ten sam.

So:

• ten sam = the same
• tego samego = of the same / the same, in genitive
• tym samym = with the same, in instrumental

Even though ten often means this or that depending on context, the fixed expression ten sam means the same.

Not with użyć.

The verb użyć takes the genitive, so you need:

• użyć tego samego środka płatniczego

But tym samym środkiem płatniczym is the instrumental form, and that would fit with a different structure, for example:

• posłuży się tym samym środkiem płatniczym = it will use the same means of payment
• zwróci pieniądze tym samym środkiem płatniczym = it will refund the money using the same means of payment

So the case depends on the verb or construction.

Środek płatniczy means means of payment or payment method/instrument.

In real-life context, it can refer to things like:

• a payment card
• a bank transfer
• cash
• another payment tool used in the original purchase

In consumer-law or store-policy language, ten sam środek płatniczy usually means the refund will be made back to the same method used originally, for example back to the same card.

Because Polish has no articles. There is no separate word for a or the.

So sklep can mean:

• a store
• the store

The exact meaning comes from context. In this sentence, English naturally uses the store because we are talking about a specific store involved in the refund.

Yes, Polish word order is flexible, and that version is possible.

The original sentence:

• Do zwrotu pieniędzy sklep użyje tego samego środka płatniczego.

puts Do zwrotu pieniędzy first, which gives the sentence a slightly formal, policy-style tone and foregrounds the refund context.

A more neutral order would be:

• Sklep użyje tego samego środka płatniczego do zwrotu pieniędzy.

Both are understandable, but the original sounds more like official wording you might see in regulations, terms and conditions, or a store policy.

It is understandable and correct, but it sounds formal and administrative.

It fits well in contexts like:

• store regulations
• legal information
• refund policy text
• e-commerce terms

In more everyday speech, a Pole might prefer something a bit more direct, for example:

• Sklep zwróci pieniądze tym samym sposobem płatności.
• Zwrot zostanie dokonany tym samym środkiem płatniczym.

So the original is natural mainly in official written language.