I had this exact thought. Unfortunately I can't find a way to check the balance of an Apple gift card without signing in to an Apple ID⁽¹⁾. So maybe you need a throwaway Apple ID...

⁽¹⁾ https://support.apple.com/en-us/108111

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wishfish 4 days ago | parent [-]

I guess a throwaway account would be essential then. That's a little weird to require an ID just to check the balance.

	▲	quesera 4 days ago \| parent [-]
		It's an anti-fraud measure. Scammers will sniff card info before activation, and poll the balance check site to see when the card is activated. They will then use the card to get merchandise which they ship to another market and sell for ~50-60% of retail value. Like solar power, money laundering is inefficient, but it's valuable when the source material is zero-cost.