Workflow: Manual Automate

{
    "nodes": [
        {
            "name": "On clicking 'execute'",
            "type": "n8n-nodes-base.manualTrigger",
            "position": [
                220,
                80
            ],
            "parameters": [],
            "typeVersion": 1
        },
        {
            "name": "Mock data",
            "type": "n8n-nodes-base.function",
            "position": [
                420,
                80
            ],
            "parameters": {
                "functionCode": "\/\/ Code here will run only once, no matter how many input items there are.\n\/\/ More info and help: https:\/\/docs.n8n.io\/nodes\/n8n-nodes-base.function\n\n\nreturn [ { json: { amount_USD: 50 } }, { json: { amount_USD: 20 } }, { json: { amount_USD: 60 } } ];"
            },
            "typeVersion": 1
        },
        {
            "name": "Summing function",
            "type": "n8n-nodes-base.function",
            "position": [
                660,
                80
            ],
            "parameters": {
                "functionCode": "\/\/ Code here will run only once, no matter how many input items there are.\n\/\/ More info and help: https:\/\/docs.n8n.io\/nodes\/n8n-nodes-base.function\n\n\/\/Setup an empty variable to hold the count\nlet total = 0;\n\n\/\/Loop over the incoming items of data\nfor (item of items) {\n  \/\/For each item of data, add the amount_USD to our total counter\n  total += item.json.amount_USD;\n}\n\n\/\/Returns a well formed JSON object with just the total_value . You can either add more data to this returned object OR use the set node afterwards to do it in a no-code way.\nreturn [ { json: { total_value: total } } ];"
            },
            "typeVersion": 1
        }
    ],
    "connections": {
        "Mock data": {
            "main": [
                [
                    {
                        "node": "Summing function",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        },
        "On clicking 'execute'": {
            "main": [
                [
                    {
                        "node": "Mock data",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        }
    }
}