Can DSYNC work with Vend to multiple list IDS? Yes
Vend to be sent to Mailchimp, there are 5 levels of Customer Roles in Vend that need to push data to 5 different lists in Mailchimp.
Where do I find the list ID in Mailchimp? Go to the list, select settings, then select list name and defaults. The list id is located under "Some plugins and integrations may request your List ID."
Where do I find the Mailchimp API keys? Visit your profile then select "extras" then select API keys. Create a key to be used in your DSYNC integration.