After connecting the MailChimp integration you will need to select a functional list to sync your Customer data to. You'll choose your list by logging in at Accumula.com and navigating to Apps > MailChimp. Here, you can choose which list from your MailChimp account you'd like to use.
To find your MailChimp lists, you'll want to navigate in MailChimp to Lists.
MailChimp List Fields and Merge Tags
MailChimp List Fields and Merge Tags must match expected MailChimp defaults for your customer data to sync to Mailchimp. If you've changed your MailChimp List Fields and Merge Tags you may need to edit them. To edit a list, find the list you want to edit and click the arrow on the right and choose Settings.
Then choose "List fields and *|MERGE|* tags". Your list should have at minimum the following fields (the types and tag names are required!):
You're welcome to add more fields, but the additional fields must NOT be set to required.
Once setup your fields and Merge Tags should look similar to this screenshot: