У разі якщо шахрай просить реквізити картки, не надсилайте їх.

У разі якщо means if / in the event that.

It is a bit more formal and official-sounding than plain якщо. In everyday speech, many people would simply say:

Якщо шахрай просить реквізити картки, не надсилайте їх.

So:

• якщо = if
• у разі якщо = if / in the event that

The longer version is common in warnings, instructions, official announcements, and security advice.

The comma separates the conditional clause from the main clause.

Structure:

• У разі якщо шахрай просить реквізити картки = the if-clause
• не надсилайте їх = the main instruction

So this works like English:

• If a scammer asks for card details, do not send them.

Ukrainian normally uses a comma to separate this kind of subordinate clause.

Шахрай means fraudster, con artist, or scammer.

In this sentence, шахрай is a general word for someone trying to deceive you in order to steal money or information.

Related words:

• шахрайство = fraud
• шахрайський = fraudulent / scam-related

So шахрай is the person, while шахрайство is the crime or activity.

Because Ukrainian просити can take a direct object without a preposition.

So:

• просити реквізити = to ask for details
• literally, something like to request details

English needs ask for, but Ukrainian often does not use an equivalent preposition here.

More examples:

• просити допомогу = to ask for help
• просити гроші = to ask for money
• просити документи = to ask for documents

This is very normal Ukrainian grammar.

Реквізити картки means card details or bank card information.

In real-life usage, this can include things like:

• the card number
• expiration date
• CVV/CVC code
• sometimes other banking details

So реквізити is a broad word for the identifying details or data connected with something.

In banking and official language, реквізити is very common.

Because картки is in the genitive singular.

The phrase is:

• реквізити картки = the details of the card

This is a noun + noun relationship, where the second noun often goes into the genitive in Ukrainian.

Compare:

• номер телефону = phone number
• адреса сайту = website address
• реквізити картки = card details

So картки here means of the card, not cards.

Because реквізити refers to multiple pieces of information or a set of details.

A single card does not usually have just one detail in this context. It has a group of identifying data, so Ukrainian naturally uses the plural.

That matches English pretty well, since we also usually say card details, not card detail.

In Ukrainian, the present tense is often used in conditional statements that describe a general situation.

So:

• якщо шахрай просить... = if a scammer asks...

Even though English may also use present tense here, learners sometimes expect a future form. But Ukrainian normally uses the present for this kind of general condition.

It means something like:

• whenever / if it happens that a scammer asks...

Не надсилайте is the imperative form, addressed to:

• more than one person, or
• one person politely

So it means:

• do not send

This -йте ending is very common for polite/plural commands:

• читайте = read
• пишіть = write
• не робіть = do not do
• не надсилайте = do not send

In public warnings and instructions, Ukrainian usually uses this polite/plural imperative because the message is addressed to the general public.

Both forms are possible in Ukrainian, but they give slightly different shades of meaning because of aspect.

• надсилати = imperfective
• надіслати = perfective

So:

• не надсилайте = don’t send / do not send as a general rule
• не надішліть = more like don’t send it off in a single completed instance

In warnings, instructions, and safety advice, the imperfective imperative не надсилайте is very natural because it sounds like a general prohibition:

• Do not send them.

Їх means them, and it refers back to реквізити.

So:

• реквізити = details
• їх = them

Because реквізити is plural, the pronoun is also plural.

This avoids repeating the noun:

• не надсилайте їх = do not send them

Ukrainian often leaves out possessive words such as your when the meaning is already obvious from context.

Here, it is naturally understood that the warning is about your card details.

A more explicit version could be:

• У разі якщо шахрай просить реквізити вашої картки, не надсилайте їх.

That means:

• If a scammer asks for your card details, do not send them.

But the shorter original sentence is completely natural and idiomatic.

Yes, absolutely.

A very natural version is:

Якщо шахрай просить реквізити картки, не надсилайте їх.

This is slightly less formal and more direct.

So the difference is mostly style:

• У разі якщо... = more formal, official, written
• Якщо... = simpler, more everyday

Both are correct.

Not completely. Ukrainian word order is fairly flexible, although some versions sound more natural than others.

The original sentence is very natural for a warning:

У разі якщо шахрай просить реквізити картки, не надсилайте їх.

You could also say:

Якщо шахрай просить реквізити картки, не надсилайте їх.

or even, for emphasis:

Не надсилайте їх, якщо шахрай просить реквізити картки.

That last version is also correct, but the original order is especially common in instructions because it sets up the condition first and then gives the action to take.

It is mostly neutral-to-formal.

Why it feels somewhat formal:

• У разі якщо is formal
• реквізити is a common official/banking word
• the whole sentence sounds like a public safety warning

You might see this kind of sentence in:

• bank messages
• government advice
• fraud prevention notices
• website security tips

A more conversational version might be:

Якщо шахрай просить дані вашої картки, не надсилайте їх.

That is a little more everyday in tone.