法律的原则是，重要信息的披露，如风险与费用、销售凭证等，要充足，能够保护公众利益。

The legal principle is that disclosure of important information, such as risks and fees, in sales documents, is enough to protect the public.

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例如，网上购物的应用程序可能允许用户使用他们的Facebook凭证进行登录，并允许他们向Facebook发布销售信息。

For example, an on-line shopping application might allow a user to sign in with their Facebook credentials and provide a means to post offers to that site.

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卖方必须提供符合销售合同规定的货物和合同可能要求的、证明货物符合合同规定的其他任何凭证。

The seller must provide the goods and the commercial invoice in conformity with the contract of sale and any other evidence of conformity that may be required by the contract.

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