Codes Table
The Codes Table - found under Settings > Advanced Settings > Developer's Corner - contains the IDs of Lists, Groups, and Recipient Fields that you will need when retrieving or updating information in MailUp via forms and/or the MailUp API.
Lists
Provides the following details about Lists that have been created in your MailUp account:
List code
List name
List Guid
Groups
Provides the following information about Groups that have been set up in your account:
List code
Group code
Group name
Data fields list
Provides information about the custom recipient fields set up in your account:
Field code
Field name