Hi @Harsh_Singh
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for Long buildup and covering , this algo will be covered in below thread
Tick By Tick Algo for Option Chain with OI Buildup and Covering - #3 by Subhajitpanja -
In this case, OI or Volume is okey to detect high liquidity.
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It can be fetched with below code
Live Market Feed - DhanHQ Ver 2.0 / API Document -
Issues with historical data has been solved now by Dhan_Tradehull_V2
see below video :
https://www.youtube.com/watch?v=HLiEpNZSD80 -
This is solved, do check video in point no 4
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Sure, Trailing SL code is added in upcoming todo videos list.