curl --request POST \
  --url https://api.meow.com/v1/bills/{bill_id}/documents/presigned-urls \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "files": [
    {
      "filename": "<string>",
      "content_type": "<string>",
      "size": 123
    }
  ]
}
'

{
  "uploads": [
    {
      "url": "<string>",
      "fields": {},
      "object_key": "<string>",
      "filename": "<string>",
      "max_bytes": 123
    }
  ]
}