curl --request POST \
  --url https://api.fourthwall.com/channel-api/v1.0/upload-url \
  --header 'Content-Type: application/json' \
  --data '
{
  "contentType": "<string>",
  "fileName": "<string>",
  "size": 123
}
'

{
  "uploadUrl": "<string>",
  "fileUrl": "<string>"
}