What API documentation is available? April 19, 2021 00:44 Updated We have robust users guides, SDKs, and other technical documentation in our Developer Center. Please note, in some Hydrogen products, use of the API is restricted for compliance reasons. Related articles How do I create and fund virtual business cards through the Hydrogen APIs? What should Hydrogen Debit APIs be used for? What methods are available to issue business funded debit cards? When do I fund the reserve account? Does Hydrogen report consumer or business card transaction data to the U.S. credit bureaus?