post
https://api.multi1.enterprise.taxbit.com/v1/account-owners//tax-documentation-data/w-8ben
Submit W-8BEN tax documentation data for an account owner. This endpoint allows you to collect and store W-8BEN form information required for tax reporting and compliance.
Note: This API supports submitting W-8BEN data that was collected outside of Taxbit. The API will validate and store the submitted information, but it does NOT generate PDFs or signed tax forms.
To produce signatures and downloadable PDF forms, clients must use the Taxbit React SDK, which provides the full end-user interview, signing flow, and PDF generation capabilities.