Create an import

Create a new seller import job from a CSV file upload.

Use this endpoint for bulk listing ingestion and migration workflows.

File validation:

• Accepts multipart/form-data with a CSV file.
• CSV header must include the REFERENCE column as the final field.
• Rejects empty files and files beyond the maximum row threshold.

Processing model:

• Stores the CSV in object storage.
• Creates import + batch records and queues background workflows.
• Returns 201 with import details and initial batch states.