WhatsApp plans to offer credit, insurance and pension products to lower-income individuals and those in rural areas in India and help digitize local small and medium-sized businesses as the Facebook service looks to make a digital payments push in its biggest market by users. The instant messaging app maker has been working with banks — including ICICI, Kotak Mahindra and HDFC — in India for the past year to explore ways to bring financial services to individuals who have yet to become part of the banking population, said Abhijit Bose,…