Learn Croatian: Blagajnica ga ne može skenirati.

Croatian enclitics (short words without their own accent, like ga) must take the second position in a sentence. Here, the subject Blagajnica takes the first position, so ga immediately follows it, coming before the negative verb ne može. If we dropped the subject, the sentence would start with the verb, and the clitic would follow it: Ne može ga skenirati.

What kind of object does ga refer to in this sentence?

The pronoun ga is the accusative form for masculine or neuter nouns. In a commercial context, it likely refers to a masculine noun like barkod (barcode), račun (receipt), or artikl (item). If the cashier were trying to scan a feminine noun like kartica (card), the pronoun would be ju or je.

Is the verb skenirati perfective or imperfective?

Like many modern loanwords adapted into Croatian with the -irati suffix (such as parkirati or kopirati), skenirati is biaspectual. This means it can act as either a perfective (completed) or imperfective (ongoing) verb depending on the context. You do not necessarily need a separate prefixed version, though you might sometimes hear odskenirati in everyday speech.

Could I use the da + present tense construction here instead of the infinitive?