PayPal AI Hackathon 2026 entry. A payment firewall for AI agents: every payment an agent tries is checked against your rules before it reaches PayPal, and Z3 proves the agent's permission can never exceed them. Stops prompt injection, overspending and lookalike shops. PayPal Agent Toolkit + MCP.
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#2866
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10/22/2026
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10/22/2026
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