Task: Post unassigned Zendesk tickets to Slack

n8n workflow JSON:
{"id":23,"name":"Zendesk-to-slack","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[360,350],"parameters":{},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","color":"#068906","position":[360,560],"parameters":{"triggerTimes":{"item":[{"hour":16,"minute":30}]}},"typeVersion":1},{"name":"Function","type":"n8n-nodes-base.function","position":[690,460],"parameters":{"functionCode":"// Create our Slack message\n// This will output a list of Ticket URLs with the status and the subject\n// 12345 [STATUS] - Ticket Subject\nlet message = \"*Unassigned Tickets*\\n\\n\";\n\n// Loop the input items\nfor (item of items) {\n  // Append the ticket information to the message\n  message += \"*<\" + item.json.url.replace(\"api/v2\",\"agent\").replace(\".json\",\"\") + \"|\" + item.json.id + \">* [\" + item.json.status.toUpperCase() + \"] - \" + item.json.subject + \"\\n\"; \n}\n\n// Return our message\nreturn [{json: {message}}];"},"typeVersion":1},{"name":"Slack","type":"n8n-nodes-base.slack","position":[870,460],"parameters":{"text":"={{$json[\"message\"]}}","channel":"jarvis-test","attachments":[],"otherOptions":{}},"credentials":{"slackApi":{"id":"2","name":"Slack"}},"typeVersion":1},{"name":"Zendesk","type":"n8n-nodes-base.zendesk","position":[510,460],"parameters":{"options":{"query":"assignee:none status<pending"},"operation":"getAll","returnAll":true},"credentials":{"zendeskApi":{"id":"1","name":"Zendesk"}},"typeVersion":1}],"active":false,"settings":{},"connections":{"Cron":{"main":[[{"node":"Zendesk","type":"main","index":0}]]},"Zendesk":{"main":[[{"node":"Function","type":"main","index":0}]]},"Function":{"main":[[{"node":"Slack","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Zendesk","type":"main","index":0}]]}}}