Novel tools and techniques are provided for invoking virtualized network functions. In some embodiments, a programmable service backbone might comprise at least one virtualized network function, and might provide virtualized network functions required to provision a service offering. In some cases, at least one application programming interface might be configured to invoke the at least one virtualized network function of the programmable service backbone. An application programming interface gateway might be configured to manage access to the at least one application programming interface, and the application programming interface gateway might comprise a security layer. Virtualized service equipment, which might be in communication with the application programming interface gateway, might provide authentication indicative of selected virtualized network functions associated with the service offering, and the security layer might release an authorized subset of virtualized network functions of the at least one virtualized network function based on the authentication.