Why did Apple charge me $24.34 online?

I bought a sim-free iPhone 6s on Apple's website three hours ago. The total was $689.56 and it's set to be picked up by my sister. When I checked the bank statement on my phone app, it showed that they charged me $24.34 aside from the iPhone's cost and the tax ($689.56). Does anyone know what the $24.34 is for?

Probably tax or maybe a charge your carrier has is my guess.

Tax?

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