Mogę odebrać przesyłkę, przekierować przesyłkę albo odmówić przyjęcia przesyłki.

Because it is the direct object of the verbs odebrać and przekierować.

The basic dictionary form is przesyłka = parcel / shipment.
Here, Polish uses the accusative singular:

• nominative: przesyłka
• accusative: przesyłkę

This is very common with feminine nouns ending in -a: the -a often changes to -ę in the accusative singular.

So:

• odbieram przesyłkę = I collect the parcel
• przekieruję przesyłkę = I will redirect the parcel

Because odmówić has a different grammar pattern from the other verbs.

You are not saying directly I refuse the parcel. You are saying I refuse acceptance of the parcel.

That is why the structure is:

• odmówić
  • noun in the genitive
• przyjęcie = acceptance
• przyjęcia = genitive singular of przyjęcie
• przesyłki = genitive singular of przesyłka

So:

• odmówić przyjęcia przesyłki = to refuse acceptance of the parcel

This is a very typical official or service-related phrase in Polish.

Because they depend on mogę.

Mogę means I can / I am allowed to / I may, and after modal verbs like this, Polish normally uses the infinitive:

• mogę odebrać = I can collect
• mogę przekierować = I can redirect
• mogę odmówić = I can refuse

This works much like English can + verb.

Mogę by itself is perfectly normal because the sentence immediately continues with the actions you can take.

The full structure is:

• Mogę = I can
• odebrać przesyłkę, przekierować przesyłkę albo odmówić przyjęcia przesyłki = collect the parcel, redirect the parcel, or refuse acceptance of the parcel

Polish often leaves out words that English might sometimes include, such as it or to do so, when the meaning is already clear.

They are related, but not the same.

• odebrać przesyłkę means to pick up / collect / receive the parcel
• przyjęcie przesyłki means acceptance of the parcel

In practice:

• odebrać focuses on the action of taking possession of it
• przyjęcie focuses on formally accepting it

That is why odmówić przyjęcia przesyłki sounds natural in delivery, postal, or courier language.

Polish could replace it with ją, but repeating the noun is often clearer, especially in official instructions, apps, menus, or service messages.

So you might also hear:

• Mogę ją odebrać, przekierować albo odmówić jej przyjęcia.

But that version is a bit denser and less transparent for a user interface.

Repeating przesyłkę makes each option very clear:

• collect the parcel
• redirect the parcel
• refuse the parcel

This is especially common in formal or customer-service Polish.

Albo means or.

In many situations, albo and lub are very similar. In this sentence, either could work. But there is a slight tendency:

• albo often sounds a bit more like a choice between alternatives
• lub can sound a bit more neutral or slightly more formal/written

So:

• odebrać przesyłkę albo przekierować przesyłkę = collect the parcel or redirect it
• odebrać przesyłkę lub przekierować przesyłkę = also possible

In everyday use, the difference is often small.

Because this is a list of options.

The commas separate the earlier items in the list, and albo introduces the final alternative. This is similar to English:

• I can collect the parcel, redirect the parcel, or refuse acceptance of the parcel.

So the punctuation is normal Polish punctuation for a list.

Yes, they are perfective forms, and that makes sense here.

Perfective verbs present an action as a completed whole:

• odebrać = to collect successfully / to pick up
• przekierować = to redirect
• odmówić = to refuse

In a sentence about available one-time actions or choices, perfective verbs are very natural. The sentence is about completing one of these actions with the parcel.

If you used imperfective verbs, the meaning would shift more toward process, repetition, or general activity, which would sound less natural here.

It sounds neutral to formal, especially like something from:

• a courier website
• a parcel locker app
• a delivery notification
• customer service instructions

The phrase odmówić przyjęcia przesyłki is especially typical of formal or administrative language.

A person speaking casually might choose shorter wording, but this sentence is very natural in service-related Polish.

Yes, Polish word order is fairly flexible, but this version is the most straightforward and natural for a list of options.

For example, Polish could move things around for emphasis, but in a practical message, the clearest pattern is:

• Mogę
  • option 1 + option 2 + option 3

So the original sentence is a good model to learn from.

A rough guide for an English speaker:

• mogę ≈ MO-gheh
  The final ę is nasal, but in normal speech it is often less strongly nasal than learners expect.

• odebrać ≈ o-DE-bratch

• przesyłkę ≈ pshe-SIUW-keh
  The cluster at the start can feel hard. Also, ł sounds like English w.

• przyjęcia ≈ pshih-YEN-cha
  The ję part is nasal, and ci before a sounds like a soft ch-type sound.

A few key sound notes:

• rz usually sounds like zh as in measure
• ł sounds like English w
• ć / ci is a soft consonant, somewhat like a softened ch
• ę is a nasal vowel, though its exact sound depends on the position in the word

Yes. Przesyłka is a broad delivery word.

Depending on context, it can mean:

• parcel
• package
• shipment
• delivery item

In a sentence like this, parcel is often the most natural English choice, especially in a courier context. But package may also fit well depending on the variety of English you use.