curl --request POST \
  --url https://api.mudstack.com/workspaces/import/upload/part \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-account-id: <x-account-id>' \
  --header 'x-workspace-id: <x-workspace-id>' \
  --data '
{
  "key": "<string>",
  "upload_id": "<string>",
  "part_no": 123,
  "mime_type": "<string>",
  "checksum": {
    "value": "<string>"
  }
}
'

{
  "signedUrl": "<string>"
}