I have the same problem: I sold something for $595.99, and they charged me $23.54 (incorrect) instead of $17.58. That's when I notice that they're actually chargind 3.9% + $0.30 instead of 2.9% + $0.30. And from the looks of it, your fee was also charged 3.9% + $0.30 ($206.10 * 3.9% + $0.30 = $8.34). I don't know what's up with that though ..
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