Shops and businesses in India will pay a fee of 0.4% of the payment, capped at ?300, on UPI payments above ?2,000 from October 15. The change ends more than six years in which the country's most widely used payment system cost merchants nothing.The charge, known as the merchant discount rate, is the share of each sale that a merchant gives up in return for accepting a digital payment. (Unsplash/ Representational)Customers are not meant to pay this fee, the finance ministry said in a statement on September 15, although in practice, that would depend on whether the merchant decides to…