Do bankowości elektronicznej potrzebuję autoryzacji i kodu PIN.

Here do means something like for or for use in, not to in the motion sense.

In this sentence:

• do bankowości elektronicznej = for electronic banking

A very important grammar point is that do requires the genitive case, which is why you see bankowości elektronicznej instead of the base form bankowość elektroniczna.

It is not the same as dla, which usually means for someone's benefit.

Because the phrase is after do, and do takes the genitive.

Dictionary forms:

• bankowość = banking
• elektroniczna = electronic

But in the genitive singular they become:

• bankowości
• elektronicznej

The adjective has to match the noun in:

• gender
• number
• case

So:

• bankowość elektroniczna = nominative
• do bankowości elektronicznej = genitive after do

Potrzebuję is the 1st person singular present tense of potrzebować.

So it means:

• I need

Compare:

• potrzebuję = I need
• potrzebujesz = you need
• potrzebuje = he/she/it needs
• potrzebujemy = we need

So the speaker is saying that they need something.

Because potrzebować normally takes the genitive case.

So:

• autoryzacja = base form
• autoryzacji = genitive singular

That is why Polish says:

• potrzebuję autoryzacji
• not potrzebuję autoryzację in standard usage

This is one of the key things to remember with potrzebować: the thing needed is usually in the genitive.

For the same reason: potrzebuję takes the genitive.

So:

• kod becomes kodu

That gives:

• potrzebuję kodu PIN

The whole phrase kod PIN means PIN code, and only kod changes here.

It can, depending on how it is used.

In this sentence, PIN stays unchanged because it is part of the phrase kod PIN, and the case ending is shown on kod:

• kodu PIN

But if PIN appears by itself, Polish often declines it, usually with a hyphen:

• Nie pamiętam PIN-u. = I don't remember the PIN.

So both ideas exist:

• kodu PIN = genitive of kod PIN
• PIN-u = genitive when PIN stands alone

Yes. Polish word order is much more flexible than English word order.

This sentence could also be:

• Potrzebuję autoryzacji i kodu PIN do bankowości elektronicznej.

That version may sound a bit more neutral in many contexts.

Starting with Do bankowości elektronicznej puts emphasis on the context first, as if saying:

• As for electronic banking...
• For electronic banking...

So the original sentence is correct; it just foregrounds the purpose.

Because Polish has no articles.

English needs:

• a PIN code
• the authorization

Polish simply uses the noun without an article:

• autoryzacji
• kodu PIN

Whether something is a, the, or just general is understood from context.

It is very close, but slightly broader and more formal.

• bankowość elektroniczna = electronic banking
• bankowość internetowa = internet banking / online banking

In many real situations, people may use these in overlapping ways, especially in banking contexts. The sentence sounds formal and natural, especially in instructions, websites, or customer support language.