I don't think $1 idea is reasonable. Not for the donation part, but for the static sum. If the transaction is $10-15, yeah. I can see myself donating $1. But what if it's only $5? I think it would be more reasonable to set a percentage or let the user decide for him/her self.
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Maturity is knowing you were an idiot in the past. Wisdom is knowing that you'll be an idiot in the future. Common sense is knowing that you should try not to be an idiot now. - J. Jacques
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