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.


Provides the following details about Lists that have been created in your MailUp account:


Provides the following information about Groups that have been set up in your account:

Data fields list

Provides information about the custom recipient fields setup in your account:

Examples of situations in which you will need to consult this page are:

  • Integration between MailUp and Wordpress (for more information see this page and this page),
  • Inserting a custom subscription form on your website (for more information see this page).