Amount, a new service that helps traditional banks compete in a digital world, has raised $81 million from none other than Goldman Sachs as it looks to help legacy fintech players compete with their more nimble digital counterparts. The company, which spun out from the startup lending company Avant in January of this year, has already inked deals with Banco Popular, HSBC, Regions Bank and TD Bank to power their digital banking services and offer products like point-of-sale lending to compete with challenger banks like Chime and lenders like Affirm…