zhīfùmìmǎ bùnéng gěi kèfú.

This sentence uses topic-first structure, which is very common in Chinese.

• 支付密码 = payment password
• Then the sentence comments on that topic: 不能给客服 = must not be given to customer service

So the structure is roughly:

• 支付密码 → as for the payment password
• 不能给客服 → you must not give it to customer service

A very literal English-style breakdown would be:

• The payment password, [you] cannot give [it] to customer service.

Chinese often puts the important thing first and then says what should or should not happen to it.

Because Chinese often omits the subject when it is obvious from context.

Here, the full idea is something like:

• 你不能给客服支付密码。
• 你不能把支付密码给客服。

But in warnings, notices, and app messages, Chinese often drops words that are easy to infer. That makes the sentence shorter and more direct.

So 支付密码不能给客服 sounds like a brief warning such as something you might see in an app or security notice.

Here 不能 means must not, cannot, or are not allowed to.

It is stronger than just saying something is not happening. It expresses prohibition or impossibility.

Compare:

• 不给客服 = not give to customer service / do not give to customer service, depending on context
• 不能给客服 = must not give to customer service / cannot give to customer service

In a security message, 不能 often has the sense of you are not allowed to do this.

Yes. Here 给 means to give ... to ...

Pattern:

• 给 + person
• give something to someone

In this sentence:

• 支付密码 = the thing being given
• 客服 = the receiver
• 给客服 = give to customer service

Because 支付密码 has already been placed at the front as the topic, the sentence does not need to repeat it after 给.

So this is similar to:

• 支付密码不能给客服。
• 支付密码，你不能给客服。

Same basic idea.

Yes, in a way.

English usually needs the object stated clearly, but Chinese often leaves it out when it is already understood.

In English:

• You must not give it to customer service.

In Chinese:

• 支付密码不能给客服。

Since 支付密码 is already the topic, Chinese does not need to repeat it later. The listener understands that what must not be given is the payment password.

客服 is short for 客户服务 and usually means:

• customer service
• customer support
• sometimes customer service staff/agent

In real-life usage, 客服 can refer either to the department or to the representative.

So in this sentence, 给客服 means:

• give it to customer service
• give it to a customer service agent

Yes, especially in the context of:

• app alerts
• scam warnings
• security reminders
• short written notices

It is concise and natural in that style.

More explicit versions would be:

• 不要把支付密码告诉客服。
• 不能把支付密码给客服。
• 不要向客服提供支付密码。

These sound a little fuller or more formal, but 支付密码不能给客服 is still natural as a short warning.

Sometimes yes, depending on the nuance.

If you want to emphasize telling someone the password, then 告诉 is very natural:

• 不要告诉客服支付密码。
• 不要把支付密码告诉客服。

If you use 给, the focus is broader: do not give/provide it to them.

In security language, both can work, but they feel slightly different:

• 给 = give / hand over / provide
• 告诉 = tell

For passwords, many learners expect 告诉, but Chinese also uses 给 in short warning language.

It could. A more explicit version is:

• 不能把支付密码给客服。

The 把 structure highlights what is being handled or transferred:

• 把 + object + verb/result

So:

• 把支付密码给客服 = give the payment password to customer service

However, in short warning language, Chinese often drops extra structure and uses a simpler topic-comment form:

• 支付密码不能给客服。

Both are understandable, but the original is shorter and feels like a notice.

It is pronounced bùnéng.

Tone details:

• 不 is normally fourth tone: bù
• 能 is second tone: néng

The special tone change for 不 happens before another fourth-tone syllable. For example:

• 不是 → bú shì

But here 能 is second tone, not fourth, so 不 stays fourth tone:

• 不能 → bùnéng

Yes, literally the Chinese is somewhat compact, so the sentence focuses on the rule about the password rather than spelling out every role.

Because of context, the normal interpretation is:

• Do not give your payment password to customer service.

Chinese warning language often leaves this kind of thing implicit. The practical meaning is clear even if the sentence does not explicitly say you or your.

That is very common in Chinese notices and safety messages.