You don't have to buy bitcoins with coinbase. They use coinbase to accept them, but the donator can get them from any method they choose, including coinbase, campbx.com, localbitcoins.com, friends, mining, etc.
But none of those methods can happen on the checkout page. My mom already knows her credit card number; why is she going to put off her purchase until she can buy BitCoin somewhere else?
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You don't have to buy bitcoins with coinbase. They use coinbase to accept them, but the donator can get them from any method they choose, including coinbase, campbx.com, localbitcoins.com, friends, mining, etc.
But none of those methods can happen on the checkout page. My mom already knows her credit card number; why is she going to put off her purchase until she can buy BitCoin somewhere else?