curl --request POST \
  --url https://api.withsplendor.com/v1/ingest/sources/{source_key}/uploads \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-splendor-tenant-id: <x-splendor-tenant-id>' \
  --data '
{
  "content_type": "<string>",
  "object_size_bytes": 1,
  "filename": "<string>"
}
'

{
  "bucket": "acme-uploads",
  "expires_at": "2026-01-15T09:30:00Z",
  "key": "uploads/ups_01H8Z3/data.jsonl",
  "part_size_bytes": 8388608,
  "required_headers": {},
  "upload_id": "mpu_1",
  "upload_mode": "multipart",
  "upload_session_id": "ups_01H8Z3",
  "upload_url": null
}