Prosus, which has invested $100 million in Sachin Bansal-founded Navi, around $80 million in supply-chain financing platform Mintifi and $100 million in Vastu Housing Finance over the past two years, plans to step up its fintech investments in India, a senior executive at the firm told ET.The Amsterdam-listed technology investor is also close to investing in artificial intelligence-led credit management startup Oolka, people familiar with the