Basecamp API integration with managed OAuth. Manage projects, to-dos, messages, schedules, documents, and team collaboration. Use this skill when users want to create and manage projects, to-do lists, schedule events, or collaborate with teams in Basecamp. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway). Requires network access and valid Maton API key.