Here's a summary of the process of integrating Sitecore with your APSIS One account. Click to jump right to a section in the article for a more detailed run-down.
You will need an APSIS Administrator role in order to administer the connector and synchronisation.
1. Install the correct Sitecore version.
2. Install the connector either on a Single Server System or a CD Server.
3. Synchronise your Segments with your APSIS One account.