To set up integration with Simpleview you will need to contact directly for a MMX Intergration API key. 

Once you have the API Key, Click the arrow next your name and Setup.

In Setup choose the Integrations tab.  Choose Simpleview as an integration, and enter the key they have given you.  Then Save!

Once you have done this, you will need to provide Simpleview with an API code and system identifier.  To do this, click on the API tab (still in setup)

Click on Add New API Key, this will give you autogenerate an API key, copy this this and the system identifier number that is found at the top.