| http://www.w3.org/ns/prov#value | - The external billing mechanism can be any type of mechanism or system for billing the customer, such as the billing system of a mobile carrier for the customer's mobile phone (as discussed above), a credit card billing system, a prepaid card billing system, a web-based payment system, a bank account billing system, or any other billing system or mechanism to which mobile community platform 202 can
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