curl --request POST \
  --url https://proxy.innk.cc/suno/submit/concat \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "clip_id": "<string>",
  "is_infill": true
}
'

{
  "code": "success",
  "message": "<string>",
  "data": "736a6f88-bd29-4b1e-b110-37132a5325ac"
}