SB = Smart Buy.
You should get the points. Call HDFC support to confirm. I did the same to get peace of mind, the first time I used Smartbuy IRCTC. Now I'm confident it works every time.
PS Similar merchant name works for different websites via smartbuy.
- MYNTRA VIA SMARTBUY - 5x points
- PHARMEASY VIA SMARTBUY - 10x points
- NYKAA VIA SMARTBUY - 5x points