Luminate API allows one to update a custom field using Constituent API create method. Once the custom field is enabled and configured under Luminate Online Setup -> Database Configuration | expanding Additional Information section, you can update the field by using its Offline Field Name. For example, by adding the parameter/value pair “custom_boolean4 = true” to the Constituent API “create” call, the web sign up field would be set to true. Other Constituent API methods such as “update” and “createOrUpdate” could also be used to update the custom field.

Contact Luminate Online Support if you do not have access to Luminate Online Setup and you would like to have a custom field enabled and configured for you.