Commerce operating system Swap has announced a $100 million Series C round, co-led by internet investment firm DST Global and global investment firm Iconiq, which is doubling down on its initial investment.What started as a returns tool has quietly grown into something bigger. Swap moved into cross-border commerce last year, setting up AI-powered infrastructure that lets agents handle transactions, recommendations and payments across global merchants.Expanding its product suite from returns to cross-border ...