It was only founded in 2019. Now, Wayflyer, one of the fastest-growing fintech start-ups in Europe, is raising a new equity investment round of more than $100 million that will value the business at more than $1.5 billion. Early investors in the Irish company, largely a mixture of high-net-worth individuals and family offices, will have seen the value of their investment rise by over 40 times when the $100 million round closes. Wayflyer closed a $76 million round series A round last May, but the revenue momentum being delivered by the firm has led to it starting its Series B…