If you have Infinia(16% RP) or Diners Black(10% RP), Buy instant vouchers from gyftr and shop via tata neu app for extra 5% coins.
If you have HDFC Tata neu Infinity card, shop directly from Tata neu app. 10% coin (5 + 5)
If you have Tata neu plus card, max you can get is 7% discount.
If you have any other HDFC credit card or even Debit card, get instant vouchers from gyftr at 5% RP or cashback and extra 5% coins from tata neu app.
I can only comment for HDFC cards.
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Apart from this, you keep getting offers in Tata neu app and Bigbasket app from time to time, you can leverage those as well. And best part is you can combine offers from both Tata neu and BB when ordering from Tata neu app.
Here’s my 2 cents -
Get an Axis select credit card as it offers 20% flat discount upto 500 on BB for purchase above 2K. Though the joining and annual fees is on the higher side (3000+gst), one can easily recover it by using it on BB, Swiggy and BMS.