A LegalTech attorney leading a developer team in Costa Rica reports a severe internationalization and UX bug in a major AI API console that converted a typed payment of 5.04 into a $504.00 charge. The input system failed to sanitize or validate localized numeric input, silently stripping the decimal and processing a single-click transaction without any confirmation modal or review of the final amount. The poster emphasizes that this is not a one-off annoyance but a systemic risk: the same behavior could turn 50.00 into $5,000.00 or worse, and it stems from basic failures to handle locale-specific decimal separators and to require explicit user confirmation on financial transactions.
After filing an immediate complaint, the user encountered only an automated support bot that denied a refund and closed the ticket without human review. A chargeback was initiated, but local banking timelines mean reimbursement may take up to 120 days, leaving the developer out-of-pocket. The account argues that financial software must validate ambiguous inputs or refuse them, and that hiding behind rigid automated support after a technical overcharge is unacceptable. The post calls on billing and engineering teams to fix the bug and address impacted international developers.
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