Clustdoc allows you to pass custom information into an application via the URL using custom_ parameters. These values are automatically captured and stored when a client accesses your portal.
This is especially useful for:
Tracking UTM sources (e.g. Google Ads, email campaigns)
Passing internal identifiers
Customizing the applicant experience
How It Works
When someone visits your application portal with a URL like this:
https://yourportal.clustdoc.com/cp/1234567-xxxyyyzzz?custom_utm_source=google&custom_agent_id=42
Clustdoc will:
Detect any parameter prefixed with
custom_Save the values into the newly created application
Make them available via merged fields
Example
URL visited:
https://yourportal.clustdoc.com/cp/1234567-xxxyyyzzz?custom_utm_campaign=summer2025&custom_ref_code=alphaX
Captured values:
utm_campaign→summer2025ref_code→alphaX
These values will be stored and accessible in your workflows.
Reusing the Data with Merged Fields
You can display these values in messages, document templates, instructions, etc., using the following merged field format:
{CUSTOM_FIELD_DATA.fieldname}
Using the earlier example:
{CUSTOM_FIELD_DATA.utm_campaign}→summer2025{CUSTOM_FIELD_DATA.ref_code}→alphaX
Read this article to know more about Merged fields
💡 Best Practices
Use lowercase and underscores for consistency (e.g.,
custom_agent_id)Avoid special characters or spaces in the parameter names
Test the link before sharing it with clients