We study the role that cross-border firm-to-firm credit plays in financing exporters. Exploiting the exogenous shock of US tariffs on Chinese goods in 2018–2019, we examine the response of Colombian firms -- bystanders not targeted by trade policy -- to redirected US demand. Using credit registry information for cross-border and domestic non-financial firm financing, we find that almost 40 percent of the total credit sourced by exporters came from cross-border firm-to-firm credit at end-2019, which represented 80 percent of their cross-border credit. In contrast to traditional trade credit, which is typically short-term, firm-to-firm credit has an average maturity of almost 2 years, and has characteristics resembling bank lending. Our findings highlight an overlooked financial channel underpinning the international trade network.