A Paytm QR on-field job, typically for a Field Sales Executive (FSE) or Service Agent, involves generating leads for Paytm's payment solutions, meeting sales targets, onboarding new retailers and merchants with QR codes and soundboxes, and providing customer support. Key responsibilities include planning market visits, conducting product presentations, ensuring successful installation and integration, gathering market feedback, and resolving issues with existing merchants to promote digital payments. The role offers competitive salaries, performance incentives, and career growth opportunities.