curl --request POST \
  --url https://api.sftpsync.io/outbound/uploads/{uploadId}/complete \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "parts": [
    {
      "partNumber": 1
    },
    {
      "partNumber": 2
    },
    {
      "partNumber": 3
    }
  ]
}
'

{
  "message": "Upload a1b2c3d4 completed. Processing started for employees.json",
  "filename": "employees.json"
}