Create a webhook

curl --request POST \
  --url https://convertly.sh/api/webhooks \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "endpoint_url": "<string>",
  "event_types": []
}
'

{
  "error": "<string>",
  "upgradeUrl": "<string>"
}