| 摘要 |
A computer-implemented method to facilitate a purchase comprising: receiving, at a first host computer, a request from a provider for payment authorization for a charge to a purchaser; examining a database coupled to the first host computer for information concerning the purchaser; providing the information concerning the purchaser to a second host computer associated with the provider; receiving at the first host computer information from a third host computer concerning a negotiated amount of the charge to the purchaser; tendering payment of the negotiated charge to the provider; and withdrawing an amount no greater than the negotiated amount of the charge from an account of the purchaser.
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