We are improving our integration with Front and will store a reference to Front's conversation ID.
Are Front's conversation IDs unique over multiple Front accounts or are they unique on a per-account basis?
In more detail, if we have 2 Front accounts, Accounts and AccountB, is it possible that both accounts have a conversation with the same ID (for example cnv_123456?
Each conversation ID within Front is completely unique. You will not find 2 exactly matched conversation IDs, regardless of if they are part of a different company.
The following Help Center article provides further information on this topic. 
I hope this information is helpful, but please do let me know if you require any further assistance! 
--Donna
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