Tunisia's postal service offers a pre-charged payment service for paying utility bills and buying things online.
突尼斯邮政为支付有效费用和网上购物提供预先支付服务。
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Such services as Payment Enabling, such as those provided by PayPal.com, and those integrated with other utility and Telco companies, may be required to be integrated into the game environment.
This article analyzes the model according to the payment variable, points out the eight premises, and demonstrates them by building marginal utility model of unemployed men.