<![CDATA[Agreements are legal instruments that play a crucial role in economic and business activities. In practice, agreements are not only related to the agreement of the parties but must also be integrated with the national legal system to be legally binding. This study aims to analyze the application of agreement law in the Indonesian legal system through a case study of breach of contract in online sales transactions. The method used is a literature study with a qualitative-descriptive approach, supported by case analysis. The results of the study indicate that online sales agreements are legally binding as long as they meet the requirements for a valid agreement as stipulated in Article 1320 of the Civil Code. However, in practice, various obstacles remain, such as breach of contract, weak consumer positions, and obstacles to law enforcement. Therefore, a comprehensive understanding of agreement law and strengthening of the law enforcement system are needed to create legal certainty and protection in digital business transactions.]]>
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