Axios Pro Exclusive ContentExclusive: Embedded payroll startup Salsa raises $20MIllustration: Tiffany Herring/AxiosSalsa, a startup providing embedded payroll infrastructure to vertical SaaS platforms, raised $20 million in Series A funding, CEO John Kramer tells Axios exclusively.Why it matters: Vertical SaaS platforms have been steadily adding various financial services to their suites, but many still lack a payroll offering.Zoom in: Altos Ventures led the round, which included participation f...