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The create-company endpoint classifies a company by NAICS through the industry field. Each value maps to a single classification, so what you send is precisely what the company is filed as. Source the value from List NAICS codes: pick an entry and send its industry label verbatim on the create-company request. Treat the reference list as the source of truth rather than hard-coding labels.
The create response and Get a company echo the resolved industry, so you can confirm the classification that was persisted.

Errors

industry is required, and a blank string counts as absent. Failures come back in the standard validation envelope; branch on error.fields.industry.code.
See Errors for the response envelope and the global codes.