post https://api.fabric.inc/v3/offers-imports/actions/generate-upload-url
Use this endpoint to create a secured S3 URL to import a CSV file, allowing for bulk data updates from the information within the file. For example, if the data in the file is price type, then only the price related data will be updated. Note that an error will be shown if the type of data included in the file does not match with the data type mentioned in the request body. You must upload only one single file, specifically in the CSV format, to the generated URL.