Amount, a company that provides technology to banks and financial institutions, has raised $99 million in a Series D funding round at a valuation of just over $1 billion. WestCap, a growth equity firm founded by ex-Airbnb and Blackstone CFO Laurence Tosi, led the round. Hanaco Ventures, Goldman Sachs, Invus Opportunities and Barclays Principal Investments also participated. Notably, the investment comes just over five months after Amount raised $86 million in a Series C round led by Goldman Sachs Growth at a valuation of $686 million. (The original raise was…