SKFS uses either a representational state transfer (REST) API or a Simple Object Access Protocol (SOAP) API.

Throughout this section, snippets of code will be displayed in different colors to help distinguish from each other the languages being used. These colors are as follows:

• Cyan code is JavaScript directed to the FIDO2 Authenticator.

• Green code is JavaScript directed to its own back-end REST web services.

• Grey code is JavaScript processing.

• Blue code is Java in the business web application.

• Purple code is JSON data structure input.

• Red code is JSON data structure output.

• Orange code is HTML.