Мне нужно подтверждение оплаты.

Because Russian usually expresses I need X with a dative pronoun plus нужен / нужна / нужно / нужны.

So the structure is basically:

мне нужен паспорт = I need a passport
literally closer to a passport is needed to me

That is why you get мне, the dative form of я.

Other examples:

• ему нужна помощь = he needs help
• нам нужны документы = we need documents

Not exactly. In this kind of sentence, нужно is the short form of нужный meaning needed / necessary.

Russian often does not use a direct verb equivalent to English to need in everyday sentences. Instead, it commonly uses this pattern:

• Мне нужен билет
• Мне нужна справка
• Мне нужно подтверждение
• Мне нужны данные

So instead of a single verb meaning need, Russian often says something more like is needed.

Also, learners often see нужно in sentences like Мне нужно уйти = I need to leave. That is very common too. In your sentence, the next word is a noun, not an infinitive.

Because подтверждение is a neuter singular noun.

The form changes to match the gender and number of the thing needed:

• нужен for masculine singular
  Мне нужен паспорт
• нужна for feminine singular
  Мне нужна виза
• нужно for neuter singular
  Мне нужно подтверждение
• нужны for plural
  Мне нужны документы

Since подтверждение is neuter singular, нужно is the correct form.

Because in the present tense, Russian usually leaves out to be.

So where English says:

I am tired
Russian just says:

Я устал / Я устала

Likewise, English says:

I need confirmation of payment
Russian says:

Мне нужно подтверждение оплаты

There is no present-tense есть here. Omitting it is normal.

Подтверждение is the noun meaning confirmation.

Here it is the thing that is needed, so it appears in its basic singular form. It also matches нужно, which tells you it is neuter singular.

A useful way to think about it is:

• мне = to me
• нужно = is needed
• подтверждение = confirmation

So the sentence is structured around confirmation being the thing needed.

Also, подтверждение is a very common noun in official, business, and administrative Russian.

Because after подтверждение, Russian uses the genitive to show confirmation of what?

So:

• подтверждение чего? = confirmation of what?
• оплаты = of payment

This is a very common noun + genitive pattern in Russian:

• номер телефона = phone number
• центр города = city center
• подтверждение заказа = confirmation of the order
• подтверждение оплаты = confirmation of payment

So оплаты is genitive singular of оплата.

Not necessarily. It means confirmation / proof of payment in a broad sense.

Depending on context, it could mean:

• a receipt
• a bank confirmation
• a payment confirmation email
• a screenshot
• a transaction record

So подтверждение оплаты is broader than just receipt.

If someone specifically means receipt, they might say:

• чек
• квитанция

But подтверждение оплаты is often used when any acceptable proof is okay.

Yes. Мне надо подтверждение оплаты is also natural.

Very roughly:

• нужно = neutral, standard
• надо = also very common, slightly more conversational in many contexts
• необходимо = more formal or official

So you may hear all of these:

• Мне нужно подтверждение оплаты
• Мне надо подтверждение оплаты
• Мне необходимо подтверждение оплаты

All are correct; the difference is mostly tone.

Yes. It sounds natural, especially in service, business, or administrative contexts.

For example:

• customer support
• online orders
• banking
• visa or document processing
• office communication

It sounds a bit more formal than casual everyday speech, but completely normal.

In very casual conversation, someone might say something longer or more specific, such as:

• Мне нужен чек
• Мне нужно доказательство, что оплата прошла
• Мне нужно подтверждение, что вы оплатили

But your sentence is perfectly natural.

Yes. Russian word order is flexible, though the neutral order here is very good:

Мне нужно подтверждение оплаты.

You could also say:

• Подтверждение оплаты мне нужно.

This puts more emphasis on подтверждение оплаты.

In most situations, the original version is the most neutral and standard.

The stress is:

Мне ну́жно подтвержде́ние опла́ты.

A rough pronunciation guide:

mnye NOOZH-na pad-tvyerzh-DYE-nee-ye a-PLA-ty

A few notes:

• мне sounds roughly like mnye
• ж in нужно sounds like the s in measure
• подтверждение has the stress on де
• оплаты has the stress on ла

If you learn the stress together with the word, it becomes much easier to remember and pronounce naturally.