The Codes Table - found under Settings > Account 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
- Description
Groups
Provides the following information about Groups that have been setup in your account:
- List code
- Group code
- Group name
Recipient fields
Provides information about the custom recipient fields setup in your account:
- Field code
- Field name