India had levelled the series in the second match but the touring side fell short by four runs in the series-decider match at the Seddon Park in Hamilton.
Shankar, who injected some momentum with Rohit Sharma for India during the run-chase, top-scored with his 43 off 28 balls.
Every tour, every game is very important for me. In the matches that I have played in so far, I think I have reasonably done quite well but I could have done a lot better. It is a great learning for me. I am just looking to get better everyday, he said.
The most important thing for us is to be really consistent and adapt ourselves to different conditions and keep performing. I think this is the only thing which can keep pushing us. T20 is such a format where we need to be flexible, as batsman we need to know the situation and be aware of what is happening around. I look to be flexible and give my best to my team, Shankar said.
India will next play home series against Australia. The series will comprise two T20Is followed by five-match ODIs, beginning February 24.