curl --request POST \
  --url https://api.valyx.com/creditNote/attachment/upload \
  --header 'Content-Type: application/json' \
  --header 'X-Valyx-Signature: <x-valyx-signature>' \
  --data '
{
  "creditNoteNumber": "<string>",
  "attachmentUrl": "<string>"
}
'

{
  "error": "<string>",
  "message": "<string>",
  "data": {
    "id": "<string>"
  }
}