Add customers to a campaign from a spreadsheet (CSV or Excel). The file is checked and stored straight away, then processed in the background; follow progress with List recipients. It accepts a draft campaign whose type is unset or already bulk_upload, and sets the type to bulk_upload; it won't switch a kiosk or automation campaign.

Prerequisites: a bearer token, a draft campaign whose type is unset or bulk_upload, and a CSV or Excel file up to 10 MB with an Email or Cell Phone column.

Authentication: Partner or Account token. The campaign's location must be inside your own account tree; otherwise 403.

Rate limit: none.