Fintech startup StudentFinance — which allows educational institutions to offer success-based financing for students — has raised a $5.3 million (€4.5 million) seed round co-led by Giant Ventures and Armilar Venture Partners. It’s now raised $6.6 million total, to date. StudentFinance launched in Spain first, followed by Germany and Finland, with the U.K. planned this year. Existing investors Mustard Seed Maze and Seedcamp, along with Sabadell Venture Capital, also participated. The startup, which launched at the beginning of 2020, provides the tech back end for institutions to offer flexible payment…