According to RBI's index, there has been a decent growth in digital payments in last one yearMumbai: There was a 40 per cent growth in digital payments across the country in a year through September 2021, according to Reserve Bank of India's (RBI) digital payment index.The index which measures adoption of online transactions, was at304.06 during September 2021 as against 270.59 in March 2021 and 217.74 in September 2020.The RBI-DPI Index continues to demonstrate significant growth in adoption and deepening of digital payments across the country the RBI said in a statement on Wednesday.The central bank had announced construction of a composite RBI Digital Payments Index (RBI-DPI) with March 2018 as base to capture the extent of digitisation of payments across the country.The RBI-DPI consists of five broad parameters that enable measurement of deepening and penetration of digital payments in the country over different periods.These parameters are payment enablers (weight 25 per cent), payment infrastructure demand-side factors (10 per cent), payment infrastructure supply-side factors (15 per cent), payment performance (45 per cent), and consumer centricity (5 per cent).The index is published on a semi-annual basis from March 2021 onwards with a lag of 4 months.