Sorry for the inconvenience caused. Tomorrow, there won't be any changes at our end. You can run your strategies without any disruption. We will update you through notification if there is any change in the sdk.
We are going to put some limitation on a number of requests like others the scale of which is not yet decided, currently it's open.
(a) No you can't get option chain data through API, it's currently only supported on pro.upstox.com.
(b) Yes, you can get order book data through API.
(c) Yes, you can get this through our REST API, but there will be a limitation in a number of requests in future.
Yes, you are correct. Historical will only give you access to OHLC data.
@Global-Moderators@shrini-viswanath : Seems Your team does not have basic unit tests in place. Cancel order is basic functionality. If it helps, I am a small trader doing around or more than 1Cr intraday turnover using API in equity market which is FULLY automated. It scares me when such basic functionality stops working and I could not trade on Friday because of this error and a profitable day wasted on my side. Advise me if I should not trade with that turnover using API.