Abstract: A system, method and computer program product for interfacing disparate partner systems to a transaction account issuer system is disclosed. A Web server receives a request from a disparate partner system, such as a Web service, a portal and/or a partner microsite and an application server extracts a partner identifier from the request. In turn, a delegate engine delegates actions corresponding to the request to one or more handlers using predetermined rules associated with the partner identifier. A worker manager manages worker code blocks which perform the actions based on a subset of the predetermined rules associated with the partner identifier. The Web server then communicates an outcome to the partner system based on the actions performed by the worker code blocks.