Database Webhook with body

Is there any way to send a body with Database Webhooks?
I'm trying to trigger OneSignal with it which uses the following curl command but I get stuck at the "data-binary" part.
curl --include \ --request POST \ --header "Content-Type: application/json; charset=utf-8" \ --header "Authorization: Basic ZjlhNTzgxZmFh" \ --data-binary "{\"app_id\": \"b27055a1-d5c9-4d52-a103-e39998abc056\", \"contents\": {\"en\": \"Someone likes you, check it out.\"}, \"headings\": {\"en\": \"New like\"}, \"channel_for_external_user_ids\": \"push\", \"include_external_user_ids\": [\"a32139cd-1209-4f47-beb7-5fb4b29ec027\"]}" \ https://onesignal.com/api/v1/notifications
Any ideas?
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