Das Servicecenter bearbeitet den Erstattungsantrag.

Because the two nouns are in different cases.

• das Servicecenter is the subject of the sentence, so it is in the nominative case.
• den Erstattungsantrag is the direct object, so it is in the accusative case.

Also, the nouns have different grammatical genders:

• das Servicecenter is neuter
• der Erstattungsantrag is masculine

So:

• nominative neuter: das Servicecenter
• accusative masculine: den Erstattungsantrag

That is why the articles are different.

In this sentence, the subject is the thing doing the action.

• bearbeitet = processes / handles / works on
• So we ask: Who or what processes the claim?
• Answer: das Servicecenter

That makes das Servicecenter the subject.

A good basic pattern for this sentence is:

• Subject + verb + object
• Das Servicecenter
  • bearbeitet
    • den Erstattungsantrag

Because the verb is conjugated for third person singular in the present tense.

The infinitive is bearbeiten = to process / to handle

Present tense:

• ich bearbeite
• du bearbeitest
• er/sie/es bearbeitet
• wir bearbeiten
• ihr bearbeitet
• sie/Sie bearbeiten

Since das Servicecenter is grammatically like es, the correct form is:

• Das Servicecenter bearbeitet ...

Often, yes, but it depends on context.

bearbeiten can mean things like:

• to process
• to handle
• to work on
• to edit or to revise in some contexts

In this sentence, with Erstattungsantrag (a reimbursement/refund claim/application), bearbeitet most naturally means:

• processes
• is handling
• works on

So it suggests administrative processing rather than physical work.

It is a compound noun, which is very common in German.

It is made up of:

• Erstattung = reimbursement / refund
• Antrag = application / request / claim

Together, Erstattungsantrag means something like:

• reimbursement claim
• refund application
• claim for reimbursement

German often combines nouns into one single word where English would use two or more words.

The last part of a German compound usually determines the gender, and here the last part is Antrag, which is masculine:

• der Antrag
• therefore der Erstattungsantrag

Because in German, all nouns are capitalized.

So in this sentence:

• Servicecenter is a noun
• Erstattungsantrag is a noun

That is why both start with capital letters.

This is a very important spelling rule in German and helps learners identify nouns more easily.

Yes, that is grammatically correct.

German allows more flexibility in word order than English because the case endings show who is doing what.

Both of these are correct:

• Das Servicecenter bearbeitet den Erstattungsantrag.
• Den Erstattungsantrag bearbeitet das Servicecenter.

The second version puts more emphasis on den Erstattungsantrag.

What does not change is the position of the conjugated verb in a main clause: it still stays in the second position.

Because Erstattungsantrag is the direct object, so it takes the accusative case, not the dative.

For a masculine noun like der Antrag, the forms are:

• nominative: der
• accusative: den
• dative: dem
• genitive: des

So:

• der Erstattungsantrag = subject form
• den Erstattungsantrag = direct object form

You would use dem Erstattungsantrag only if the grammar required dative, which it does not here.

Yes, Servicecenter is normally treated as neuter: das Servicecenter.

Loanwords and modern business terms in German sometimes have genders that learners must simply memorize, but there are a few helpful points:

• Words ending in -center are often used as neuter
• Dictionaries will show the gender, for example: das Servicecenter

Unfortunately, grammatical gender is not always predictable from meaning alone, so it is best to learn nouns together with their articles:

• das Servicecenter
• der Erstattungsantrag

A simple learner-friendly pronunciation guide is:

• bearbeitet ≈ beh-AR-bye-tet

A few helpful notes:

• be- is usually unstressed
• the stress is on AR
• ei sounds like English eye
• the final -et is pronounced, not silent

So it is not like English bear. The beginning sounds more like beh than the animal bear.

Not in this sentence.

Here, das is the definite article meaning the, because it goes directly with the noun Servicecenter:

• das Servicecenter = the service center

German das can also mean that in other contexts, but here it is clearly an article, not a demonstrative pronoun.

The sentence follows a very common German main-clause pattern:

• Subject + conjugated verb + object

Here that is:

• Das Servicecenter = subject
• bearbeitet = conjugated verb
• den Erstattungsantrag = direct object

So this is a very good example of a straightforward German sentence with:

• normal verb-second word order
• a nominative subject
• an accusative object