Do we have a api to create a session where only a 6 digit join code is generated ? using an api

I am trying to integrate Screenconnect with my system , where i want when my agent tried to connect to a customer then the customer receives a email with the joining code and the link to download screeconnect application , 
Right now the code i am able to generate is very long ie 16 digits , i want it to be 6 digits long only.