Amennyiben a bankkártya nincs itt, a bankfiókban kártyapótlást kérek.

Amennyiben means if, provided that, or in the event that. It is more formal than the very common ha.

So:

• Amennyiben a bankkártya nincs itt... = If the bank card is not here...
• In everyday speech, many speakers would simply say Ha a bankkártya nincs itt...

Using amennyiben makes the sentence sound more official, careful, or written.

Hungarian has special negative forms of van (to be) in the present tense:

• van = is / there is
• nincs = is not / there is not

So:

• a bankkártya itt van = the bank card is here
• a bankkártya nincs itt = the bank card is not here

You do not normally say nem van in standard Hungarian for this meaning.

Both word orders can exist, but they give slightly different emphasis.

• A bankkártya nincs itt. = neutral: The bank card isn’t here.
• A bankkártya itt nincs. = more contrastive, something like The bank card isn’t here (though maybe it is somewhere else).

In your sentence, nincs itt is the most natural neutral order.

Bankkártya is a compound noun:

• bank = bank
• kártya = card

So literally it is bank-card, meaning bank card. Hungarian very often forms nouns this way by joining words together into a single compound.

A is the definite article, meaning the.

• a bankkártya = the bank card

Hungarian uses a before words beginning with a consonant, and az before words beginning with a vowel.

Here, bankkártya starts with b, so the article is a.

Bankfiókban means in the bank branch or at the bank branch.

It breaks down like this:

• bankfiók = bank branch
• -ban / -ben = in

So:

• bankfiókban = in a/the bank branch

The ending is -ban here because of vowel harmony. Hungarian chooses between -ban and -ben depending on the vowels in the word.

That is just a normal difference between the two languages. Hungarian often uses the inside/in case where English prefers at.

So a bankfiókban may be translated naturally as:

• in the bank branch
• at the bank branch

Even though the Hungarian form literally contains in.

Kártyapótlást comes from:

• kártya = card
• pótlás = replacement, replenishment, making up for something missing
• kártyapótlás = card replacement

In this sentence, it means a replacement card or card replacement as a service/procedure.

The exact English translation depends on context, but the Hungarian word refers to replacing the missing card.

The -t marks the accusative case, which is often the direct object of the verb.

Here, kérek means I ask for / I request, and the thing being requested is kártyapótlás. Because it is the direct object, it takes accusative -t:

• kártyapótlás = card replacement
• kártyapótlást = card replacement (as the object)

So the structure is basically:

• kártyapótlást kérek = I request card replacement / I ask for a replacement card

Hungarian often leaves out the article when the object is indefinite or when the speaker is referring to something in a general sense.

So:

• kártyapótlást kérek = I request card replacement / a card replacement

If you added a definite article, the meaning would become more specific:

• a kártyapótlást kérem = I am requesting the card replacement

That sounds more like a particular, already identified replacement process. In your sentence, the article-free version is the natural choice.

Kérek is the first person singular form of kér, which means to ask for, to request, or sometimes simply to ask.

So kérek means:

• I ask for
• I request

In this sentence:

• kártyapótlást kérek = I request a card replacement

This is a very common verb in practical situations, such as ordering, requesting documents, or asking for help.

Kérek is the indefinite conjugation form. Hungarian verbs can use different endings depending partly on whether the object is definite or indefinite.

Here the object is effectively indefinite:

• kártyapótlást kérek = I request a card replacement

So kérek is the normal choice.

Compare:

• kérek egy kávét = I’d like a coffee
• kérem a kávét = I would like the coffee / I request the coffee

The second one is more definite.

Yes, in meaning, mostly yes.

• Amennyiben a bankkártya nincs itt, a bankfiókban kártyapótlást kérek.
• Ha a bankkártya nincs itt, a bankfiókban kártyapótlást kérek.

Both mean essentially the same thing. The difference is style:

• amennyiben = more formal, official, written
• ha = more neutral, common, everyday

Hungarian word order is flexible and often reflects emphasis or topic structure rather than a fixed English-style pattern.

In:

• a bankfiókban kártyapótlást kérek

the location a bankfiókban is placed early, which is very natural. It sets the scene: at the bank branch, this is what I do.

A more straightforward English-like order would still be understandable in Hungarian, but the original version sounds natural and well-structured.

Yes, that is a very natural translation.

Depending on context, kártyapótlást kérek could be rendered as:

• I request a card replacement
• I ask for a replacement card
• I apply for a replacement card

The exact English wording depends on what sounds most natural in the situation. The Hungarian is broad enough to allow these possibilities.

Yes. Hungarian uses compound nouns very frequently.

Here are the parts:

• bankkártya = bank
  • kártya = bank card
• bankfiók = bank
  • fiók = bank branch
    (literally bank
    • branch/office)
• kártyapótlás = kártya
  • pótlás = card replacement

This is extremely common in Hungarian, and learning to recognize compounds helps a lot with vocabulary.

Yes. Bankfiók specifically means a branch of a bank, not the bank as an institution in general.

So:

• bank = bank
• bankfiók = bank branch

If someone says a bankfiókban, they mean in/at the branch office.

Yes, but nincs is much more common.

• nincs = standard, common short form
• nincsen = longer form, possible but less usual in normal speech

So:

• a bankkártya nincs itt = the most natural version
• a bankkártya nincsen itt = also correct, but less common

It sounds understandable and correct, but somewhat formal and slightly administrative because of words like amennyiben and kártyapótlást kérek.

A more everyday version might be:

• Ha nincs itt a bankkártya, a bankfiókban kérek újat.
• Ha a bankkártya nincs itt, kérek egy pótkártyát a bankfiókban.

But your original sentence is perfectly grammatical and suitable for formal or written context.