把以下条款翻译为英文并将其改为正式商务合同语气，要求使用被动语态和专业术语。

如甲方未能按期支付货款，需支付给乙方一定的滞纳金，滞纳金的具体比例按合同约定。
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In the event that Party A fails to make payment for the goods within the agreed time frame, Party A shall be obligated to pay a certain late fee to Party B. The specific percentage of the late fee shall be determined in accordance with the provisions of the contract.
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