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I've never used, but

quote:

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Is there a fee to use the service?
The funding of a ChargeSmart™ payment account is always free. However, depending on the biller, there is either a blended fee (including a percentage of the transaction cost) or a flat fee associated with your transaction. The fee will be displayed prominently before you proceed with your transaction, and again at the "Confirm your Payment" screen before the card is charged.

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This is quite vague. Curious what kind of fees are associated with a typical transaction.