American Express has a multiyear strategy to expand its position in business-to-business (B2B) payments through new products and capabilities as well as through acquisitions and partnerships. Its Sync Commercial Card Partner Program is the latest component in its strategy.

Sync will provide software developers and fintechs that serve US-based customers with a suite of APIs that use the latest design principles and enable publishers to manage their integrations with the support of a dedicated account representative. The first APIs will let American Expre...