Bengaluru: Festive spending drove a sharp increase in digital payments during the Diwali weekend, with transactions on the Unified Payments Interface rising 28% year-on-year to 3.75 billion over four days, according to data released by the National Payments Corporation of India (NPCI). Transaction value during the November 5-8 period increased 38% to Rs 4.99 lakh crore.During the corresponding four days last year — from October 17 to 20 — UPI