Data Source ID

Upload your initial data source from the Form Admin menu -> Data sources -> Add Data Source (link).
Click View/Edit, then “Update Data” to find the data source’s ID.

File Details

A CSV file needs to be included in the PUT call. The file will need to meet these requirements:

Unique identifier column (which was identified when the data source was created) must contain unique values
Column headers must be unique
Column headers must include the headers existing in the current data source. File can contain new columns.

The Data Source Upload API is currently optimized for files up to 10,000 rows. While there is no enforced file size limit, uploading very large data sets may result in timeouts.

For additional information on setting up prefill for a form, including adding users to a data source, please refer to this article: https://help.informedk12.com/hc/en-us/articles/26159147874707-How-to-Set-Up-forms-to-be-Prefilled-by-a-Data-Source