Importing data is only as complicated as you make it. During our onboarding or even sales stages, we can determine what will need to be done and a timeframe to get it done. We have amazing documentation for developers and marketers alike. We offer the ability for marketers to import flat files into our lists to full relational data tables for companies who really want to get the best use of their data.
Links:
Our API documentation.
Our users guide to contacts.