Section 269SU was inserted by finance act 2019 w.e.f. 01/11/2019 . This section is about maintaining specified electronic system to accept payments. E.g Qr Code, BHIM, UPI etc. This section was mandatory for persons having total sales, turnover or gross receipts, as the case may be, in business exceeds fifty crore rupees during the immediately preceding previous year. Read here more about Section 269SU
Now, CBDT clarifies vide circular No 12/2020 dt. 20/05/2020 that Sec. 269SU shall not be applicable in case of person having only B2B transactions and at least 95% of business receipts is in any mode other than cash.
#Read full text of the clarification here:
https://www.incometaxindia.gov.in/communications/circular/circular_no_12_2020.pdf
