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The mock server POSTs a JSON body to your game service's game_launch — agent_code, agent_token, agent_secret, user_id, game_id, type, currency, lang, demo_agent. btrptr authenticates on agent_code + agent_secret (agent_token is ignored), so agent_secret is REQUIRED. It reads game_url (lumos facade) or launch_url (agent facade) from the JSON and loads it in the iframe. The game must be configured to call THIS mock as its wallet API — watch the Console tab.