Can n8n Retrieve Keap Custom Fields and Tag Timestamps via the XML API?

Below is the answer based on the available documentation for the Keap node in n8n:

1. Custom Fields in Contacts

Currently, the Keap node operations in n8n focus on basic contact management (create/update, delete, retrieve). The documentation does not list dedicated support for extracting custom fields from contacts. Therefore, if custom fields are not part of the standard fields returned by the "Retrieve a contact" or "Retrieve all contacts" operations, then n8n does not provide built‐in functionality to extract them.

2. Tags with Timestamp Data

The Keap node uses the REST API for its operations. As noted in the documentation, contact tag-related operations (such as retrieving all contact tags) are implemented using the REST API. Since the Keap REST API does not provide the date a tag was applied and n8n’s integration is built on that API, there isn’t a way to make XML API requests (which would include the timestamp) using the native Keap node in n8n.

In summary, n8n’s Keap nodes currently only work with the REST API, so you won’t be able to retrieve extra tag metadata (like applied timestamps) nor extract custom fields unless the REST API itself provides those fields.