Tuna is on a mission to “fine tune” the payments space in Latin America and has raised two seed rounds totaling $3 million, led by Canary and by Atlantico. Alex Tabor, Paul Ascher and Juan Pascual met each other on the engineering team of Peixe Urbano, a company Tabor co-founded and he referred to as a “Groupon for Brazil.” While there, they came up with a way to use A/B testing to create a way of dealing with payments in different markets. They eventually left Peixe Urbano and started Tuna…