Associate an entity with an array of instruments.

Instruments can be associated with entities in the Unit21 system by providing the IDs of these instruments within the instrument_ids section of the /entities/create request.

Specify the instrument_id of the instrument (and not the unit21_id) when associating instruments through this method.

If we do not find any instruments with a corresponding instrument_id in our system, we will create a placeholder for it. Instrument details can then be supplemented through the /instruments/create or /instruments/update endpoints.

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