If you do not have an insanely large volume, for example, fast food chains, it is very difficult to get a trading account where the transaction price is possible for micro-payments. Most providers will offer an aggregation model in which you sell your content, but periodically bill your customers, that is, issue them once a month so that several purchases are combined together, which makes transaction fees less significant.
Here is one provider offering this model:
http://www.allcharge.com/services-billing-micro-payments.asp
I do not work on the above company (in fact, I work in a payment company that does not offer micropayments).
Not the answer you were hoping for, I'm sure, but hopefully this helps.
Mikeh
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