Mercantile — independent third-party profile of a public API surface, by API Evangelist. Mercantile is a branded business credit card platform operated by Onboard Partners LLC (Boston, MA) that helps fintechs, consumer brands, and trade associations launch and run custom affinity credit card programs.
company payments fintech credit-cards mastercard apis-json embedded-finance business-credit card-issuing loyalty-and-rewards affinity-programs
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Updated
Oct 30, 2026