A method of providing an application with an interface to a composite network service includes: a) receiving a request for a composite network service at an exposure engine associated with an SCF, the composite network service associated with multiple network services, multiple service providers, multiple service networks, or multiple communication sessions; and b) selecting an API container based on the requested composite network service, the API container formed by a composition engine associated with the SCF and including composite service logic and composite enabler logic or composite normalization logic. The composite service logic including program calls. The composite enabler logic providing external protocol interfaces that do not require normalization. The composite normalization logic providing external protocol interfaces that require normalization. An apparatus for providing an application with an interface to a composite network service includes the exposure engine and API engine.