The All CAS by Liaison - SSN source format will import social security numbers for students. Learn more about CAS coursework verification in Liaison's Applicant Processing Reference Guide. Each course entered on the application will be represented by its own row in the coursework file.
There are additional optional source formats available that may be configured if desired:
All CAS by Liaison - SSN (described in this article)
🔔 Important!
Starting September 2025, in the scheduled delivery feature in WebAdMIT, scheduled jobs will be disabled if there are consecutive failures. Specifically, if WebAdMIT is unable to connect to the Slate SFTP after 10 consecutive attempts (this includes two retries for each attempt for a total of 30 connection attempts), the export job will be disabled in WebAdMIT.
Adding the source format
To add the All CAS by Liaison - SSN source format:
Select Database from the top navigation bar and select Source Format Library.
Search for "All CAS by Liaison - SSN" and select Add.
Navigate to the new source format and click Edit.
On the Import Automation tab, update the Import Remote Server field and replace the [ENTER USER IDENTITY ID HERE] with the USER IDENTITY ID provided by Liaison and the [ENTER YOUR API KEY HERE] with the API Key provided by Liasion:

🔔 Important!
You will not be able to map any fields until you receive or manually upload a file from Liaison. Be sure to use a file delivered by the CAS API subscription for social security numbers to ensure that all possible data points are included. By default, blank/null values are not sent via CAS API subscriptions, so if you need to adjust remap settings for a particular source field, and you do not see it on the Fields page, you will need to upload this file again.
Configuring the remap settings
The remap settings for the All CAS by Liaison - SSN source format are pre-configured
Select Database from the top navigation bar and select Source Formats.
Find the All CAS by Liaison - SSN source format and select Remap to confirm destinations and to set up additional data mappings for this source format.
After selecting Remap, you will see all of the Slate destination fields currently mapped for the data points included in the file.
There is a unique for merging field that is used to properly match the coursework file to the appropriate person record within Slate. Another unique for merging field is mapped to associate each course with the appropriate school record. These fields are pre-mapped in the All CAS by Liaison - SSN source format:
CAS/Liaison Person ID
This field is automatically created during an overnight process that occurs after you have added the All CAS by Liaison - Applications source format.
The following fields are pre-mapped and should not be adjusted, nor should other fields be mapped to these destinations.
Source Field | Destination Field |
|---|---|
| CAS/Liaison Person ID |
| Record: SSN |
How do I activate the import?
Refer to the section Activation below.
Activation
Use the same testing steps as with the required source format. Once you have finished testing the remap configurations, the source format can be activated in production:
