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actually, it returned 1 min data at 9:45 candle.
Are you looking for 15 minutes of data for 09:30:00 to 09:44:59AM?
Yeah, that's correct because if you request for 15-minute candle data at it's start,here i.e 09:45 AM, it will have same values as of 1-minute data of 09:45 AM, as current available data is only for 1st minute to form a 15minute candle.