In the Symbol Based selection type, you manually choose the exact option contract that you want to trade. The platform does not search for another contract or make any automatic selection.
For example, suppose the available option contracts are:
-NIFTY21JUL2622500CE
-NIFTY21JUL2622550CE
-NIFTY21JUL2622600CE
If you select NIFTY21JUL2622550CE, then the generated JSON will always contain that exact option contract.
Even if the premium changes from ₹120 to ₹180 or drops to ₹90, the platform will still use NIFTY21JUL2622550CE because you selected the symbol manually.
In simple words, Symbol Based is useful when you already know exactly which option contract you want to trade.
(Refer to the image below for the Symbol Based configuration.)
