The DIDforSale API is designed to provide you with a comprehensive tool set to make API development a breeze. didML, an acronym for DIDforSale Mark up Language, puts together set of instructions to be used when programming your inbound calls. These instructions lay down step by step process for what to do when someone calls your DIDforSale (DFS) phone number. As soon as the number is dialed DFS will read the instructions from the URL where didML has listed actions that can be performed. These actions are defined as didML verb. Some of the examples are: Say caller name, play music, prompt for user input by pressing key.