| 摘要 |
A method for paying back customers for unused service units remaining after a billing cycle. A payback amount is determined by the product of the number of unused service units remaining and the payback rate amount. The payback amount credited to the customer is the calculated payback rate or a maximum payback amount, wherever is smaller. A total payback amount can be determined based on a combination of payback amounts for various services, including voice services, texting services, email services, and/or data storage services.
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