Task: First Flow Beginner course

n8n workflow JSON:
{"nodes":[{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[460,300],"parameters":{"url":"https://internal.users.n8n.cloud/webhook/custom-erp","options":{"splitIntoItems":true},"authentication":"headerAuth","headerParametersUi":{"parameter":[{"name":"unique_id","value":"recNa538eIaOiOdU5"}]}},"credentials":{"httpHeaderAuth":{"id":"4","name":"Header Auth account"}},"typeVersion":1},{"name":"Airtable","type":"n8n-nodes-base.airtable","position":[1000,200],"parameters":{"table":"processingOrders","options":{},"operation":"append","application":"appBZO5BP7ZzqcTXA"},"credentials":{"airtableApi":{"id":"5","name":"Airtable account"}},"typeVersion":1},{"name":"IF","type":"n8n-nodes-base.if","position":[640,300],"parameters":{"conditions":{"string":[{"value1":"={{$json[\"orderStatus\"]}}","value2":"processing"}]}},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[820,200],"parameters":{"values":{"number":[{"name":"orderId","value":"={{$json[\"orderID\"]}}"}],"string":[{"name":"employeeName","value":"={{$json[\"employeeName\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Function","type":"n8n-nodes-base.function","position":[980,460],"parameters":{"functionCode":"let totalBooked = items.length;\nlet bookSum = 0;\n\nfor( let i=0; i < items.length; i++) {\n  bookSum = bookSum + items[i].json.orderPrice;\n}\n\nreturn [{json:{totalBooked,bookSum}}];"},"typeVersion":1},{"name":"Discord","type":"n8n-nodes-base.discord","position":[1200,460],"parameters":{"text":"This week we have {{$json[\"totalBooked\"]}} booked orders with a total value of {{$json[\"bookSum\"]}}. My unique ID: {{$node[\"HTTP Request].parameter[\"headerParametersUi\"][\"parameter\"][0][\"value\"]}}","webhookUri":"https://internal.users.n8n.cloud/webhook/course-level-1"},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[260,300],"parameters":{"triggerTimes":{"item":[{"hour":9,"mode":"everyWeek"}]}},"typeVersion":1}],"connections":{"IF":{"main":[[{"node":"Set","type":"main","index":0}],[{"node":"Function","type":"main","index":0}]]},"Set":{"main":[[{"node":"Airtable","type":"main","index":0}]]},"Cron":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]},"Function":{"main":[[{"node":"Discord","type":"main","index":0}]]},"HTTP Request":{"main":[[{"node":"IF","type":"main","index":0}]]}}}