For the same stock, different exchanges use different instrument tokens. Thus, the instrument token naturally aids in your decision regarding the exchange. For instance, the SBIN-NSE instrument token is 1900, but the SBIN-BSE instrument token is 1899.
Change the "es" parameter to the relevant exchange(nse_cm -> NSE, bse_cm -> BSE, nse_fo -> NFO, bse_fo -> BFO, cde_fo -> CDS, bcs_fo -> BCD) while consuming Place Order API.