Business software applications use the SWIFTNet Link (SNL) application programming interface (API) to access and use SWIFTNet services. The SNL is the mandatory network interface to SWIFTNet. SWIFTNet requires SNL for all external interfaces. The SNL also includes background processes that support messaging, security, and service management functions. The SNL is incorporated into SWIFTAlliance WebStation and SWIFTAlliance Gateway (SAG).