I might not be following the conversation correctly; however, Jonathan, could you not try doing two API calls - one for Users in your LMS (this contains the id, user_id, sis_user_id, integration_id) and then another for Conversations and then merge the tables on the id field?
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I am a web developer and administrator for DC Public Schools. I have been working in web development for 2 years and in education for 12. Before working as a developer, I taught English as a Second Language abroad and in the United States.