至于好玩和有用，其实更多就是前端和后端收费的区别。
As to mix amusedly useful, actually more is the distinction that front and back end collect fees.
提供者必须确保与后端(back - office)系统集成，以便预订、配给、计量、估价和收费、计费和其他功能支持用户活动和事务。
The provider must ensure integration with back-office systems so that ordering, provisioning, metering, rating and charging, billing and other functions support consumer activities and transactions.
提供者必须确保与后端(back - office)系统集成，以便预订、配给、计量、估价和收费、计费和其他功能支持用户活动和事务。
The provider must ensure integration with back-office systems so that ordering, provisioning, metering, rating and charging, billing and other functions support consumer activities and transactions.
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