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curl --request PUT https://api.kite.trade/portfolio/positions
-H "X-Kite-Version: 3" \
-H "Authorization: token api_key:access_token" \
-d "tradingsymbol=INFY" \
-d "exchange=NSE" \
-d "transaction_type=BUY" \
-d "position_type=day" \
-d "quantity=100" \
-d "old_product=MIS" \
-d "new_product=CNC"
If it is carry forwarded from the previous day then it is overnight.