This study aims to analyze the provisions on business actors' responsibilities for defaults in online sales agreements based on Law Number 8 of 1999 concerning Consumer Protection and to examine obstacles and efforts to optimize consumer protection. The research method used is normative legal research with a statutory, conceptual, and case-based approach through literature review. The results indicate that business actors' responsibilities are regulated through the integration of the Civil Code, the Consumer Protection Law, and the Electronic Information and Transactions Law, applying the principle of absolute liability and a reversal of the burden of proof. However, its implementation still faces obstacles such as suboptimal e-commerce regulations, low consumer legal literacy, the limited role of the BPSK (Regional Consumer Protection Agency), detrimental standard clauses, and unclear marketplace responsibilities. Therefore, regulatory reform and institutional strengthening are needed to improve consumer protection in online sales transactions.
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