Indian Overseas Bank unveils IOB UPI Vyapar . Registered mobile number in bank account to be entered by the customer. OTP will be sent to the customer for initial registration and device binding. The SIM card of registered mobile number should be present in app installed device to make any payments. Features include • In-app payment voice notification. • Biometric login • Merchant Profile • QR Code Generation • Recent Transaction • Payment History • Multiple App language.