A method for applying agency and regulation modeling in a multi-tenant architecture system includes accessing merchant's representation in an identity manager. The merchant is managed via a full representation by an original identity manager. The method includes performing a first service for the merchant via the representation, and determining, based on results of the first service and on policies of the first service provider, that performance of a second service is required for completion of the first service. The second service is provided by a second service provider onboarded into the first service provider, where the second service amends policy requirements of the first service provider. The method includes accessing a first subservice of the second service using the representation to generate second results for use at a second subservice of the second service, the second subservice configured to use transaction resources of the first representation.