Is there a API for creating Tax Jurisdictions and Taxes in code or is JurisdictionManager and TaxManager what I have to work with to save new Tax Jurisdictions?
Im using Commerce 10
Yes, JurisdictionManager and TaxManager are the classes to create new Tax Jurisdictions. They might not be the best APIs in the world but they do the work.
An other alternative is to use TaxImportExport if you have CSV files for tax definition already. It uses those two classes internally, btw,