S obzirom na dokaz o uplati, snabdevač će proveriti obračun.

S obzirom na is a fixed expression meaning considering, given, or in view of.

In this sentence, it introduces the reason or basis for the action:

• S obzirom na dokaz o uplati = Considering the proof of payment / Given the proof of payment

It is very common in formal and semi-formal Serbian.

This is basically a set phrase, so it is best learned as a whole: s obzirom na.

A learner does not usually need to analyze it word by word in everyday use. What matters most is:

• s obzirom na + accusative
• it means considering / in view of

Examples:

• S obzirom na situaciju... = Considering the situation...
• S obzirom na vreme... = Given the weather / considering the time...

So in your sentence:

• S obzirom na dokaz o uplati...

Dokaz means proof or evidence.

The phrase dokaz o uplati literally means proof about the payment, but in natural English this is proof of payment.

Here:

• dokaz = proof
• o = about / concerning
• uplati = payment in the form required after o

So o uplati is not a separate idea like about payment in English conversation; it is just the standard Serbian way to say proof of payment.

Good question. After na in s obzirom na, the noun is in the accusative.

But dokaz is a masculine inanimate noun, and in the singular its accusative form is the same as the nominative.

So:

• nominative: dokaz
• accusative: dokaz

That is why the form does not visibly change.

If the noun were different, you might see a clearer change.

Because the preposition o normally takes the locative case.

The base noun is:

• uplata = payment

Its locative singular is:

• uplati

So:

• o uplati = about the payment / concerning the payment

That is why the sentence has dokaz o uplati, not dokaz o uplata.

Snabdevač means supplier, provider, or sometimes vendor, depending on context.

It is a masculine noun. In business or utility contexts, it often refers to the company or entity supplying goods or services.

Examples:

• snabdevač električnom energijom = electricity supplier
• snabdevač gasa = gas supplier

In your sentence, snabdevač is the subject of the sentence.

This is the Serbian future I form.

It is made with:

• a form of hteti in its short/clitic form: ću, ćeš, će, ćemo, ćete, će
• plus the infinitive

Here:

• će proveriti = will check / will verify

So:

• snabdevač će proveriti obračun = the supplier will check the calculation/bill

This is the normal way to express a future action.

Because će is a clitic, and clitics in Serbian usually come in second position in the sentence or clause.

So:

• Snabdevač će proveriti obračun. is normal.

You may also see future forms written as one word in some cases, for example:

• proveriće

But in a sentence with an expressed subject, snabdevač će proveriti is completely standard.

In standard Serbian, that would not be the normal word order.

Because će is a clitic, it generally needs to be in second position, so:

• Snabdevač će proveriti obračun. ✔
• Snabdevač proveriće obračun. ✘ awkward/nonstandard in normal usage

You could also see:

• Proveriće obračun snabdevač.

But that changes the emphasis and sounds less neutral.

Proveriti is a perfective verb, meaning to check/verify something once and bring the action to completion.

That fits this sentence well because it refers to one specific future action:

• the supplier will check the bill/calculation

Proveravati is imperfective, and would suggest repeated, ongoing, or habitual checking.

So:

• proveriti = to check, verify, complete the check
• proveravati = to be checking, to check repeatedly

In this context, proveriti is the natural choice.

Obračun can mean different things depending on context, such as:

• calculation
• statement
• billing calculation
• invoice calculation
• settlement

In an administrative or payment-related sentence like this one, it often refers to a billing calculation or account statement/check of charges.

So the exact English translation depends on the wider context, but the Serbian word itself is perfectly normal in formal and business language.

Yes, it sounds formal and administrative/business-like.

Several things make it sound formal:

• S obzirom na...
• dokaz o uplati
• proveriti obračun
• snabdevač

This is the kind of sentence you might see in:

• email correspondence with a company
• billing notices
• customer support messages
• official letters

In casual speech, a person might choose simpler wording.

Yes, Serbian word order is fairly flexible, but not completely free.

The neutral order here is:

• S obzirom na dokaz o uplati, snabdevač će proveriti obračun.

You could also say:

• Snabdevač će, s obzirom na dokaz o uplati, proveriti obračun.

This is still correct, but it shifts the rhythm and emphasis a little.

What usually stays important is:

• the phrase s obzirom na stays together
• the clitic će stays in its normal second-position behavior

Serbian does not use articles like English a/an/the.

So nouns appear without articles:

• dokaz = proof / the proof / a proof, depending on context
• snabdevač = supplier / the supplier
• obračun = calculation / the calculation / the bill

You figure out whether the meaning is definite or indefinite from the context.

That is why Serbian learners of English often struggle with articles, and English speakers learning Serbian often expect them where Serbian simply does not have them.

Yes, especially these letters:

• č in snabdevač, obračun
  pronounced like ch in church, but usually crisper

• ć does not appear in this sentence, but learners often confuse it with č
  Serbian distinguishes them, though many beginners do not hear the difference clearly at first

• š in obzirom? Actually not there; but s and z combinations can still be tricky in connected speech

Also, try to pronounce each written vowel clearly:

• Serbian spelling is quite phonetic compared with English

A rough pronunciation guide:

• S obzirom na ≈ s ob-zee-rom na
• dokaz o uplati ≈ do-kaz ooo oo-pla-ti
• snabdevač će proveriti obračun ≈ snahb-deh-vach che pro-veh-ri-ti ob-ra-choon

That is only approximate, but it can help as a starting point.