Create an account holder

Creates an account holder that [represents the sub-merchant's entity](https://docs.adyen.com/marketplaces-and-platforms/classic/account-structure#your-platform) in your platform. The details that you need to provide in the request depend on the sub-merchant's legal entity type. For more information, refer to [Account holder and accounts](https://docs.adyen.com/marketplaces-and-platforms/classic/account-holders-and-accounts#legal-entity-types).