Task: Receive updates on form submission in Mautic and send SMS notification

n8n workflow JSON:
{"id":"13","name":"Receive updates when a form is submitted in Mautic, and send a confirmation SMS","nodes":[{"name":"Mautic Trigger","type":"n8n-nodes-base.mauticTrigger","position":[510,300],"webhookId":"9dce2b84-33fe-4816-ae4b-301c208b5384","parameters":{"events":["mautic.form_on_submit"]},"credentials":{"mauticApi":"mautic"},"typeVersion":1},{"name":"Twilio","type":"n8n-nodes-base.twilio","position":[710,300],"parameters":{"to":"={{$node[\"Mautic Trigger\"].json[\"mautic.form_on_submit\"][0][\"submission\"][\"results\"][\"phone_number\"]}}","from":"1234","message":"=Hey, {{$node[\"Mautic Trigger\"].json[\"mautic.form_on_submit\"][0][\"submission\"][\"results\"][\"first_name\"]}} 👋\nThank you for signing up for the Webinar - Getting Started with n8n. The webinar will start at 1800 CEST on 31st October 2020.\nSee you there!"},"credentials":{"twilioApi":"twilio"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Mautic Trigger":{"main":[[{"node":"Twilio","type":"main","index":0}]]}}}