Task: A test workflow

n8n workflow:
{"nodes":[{"name":"Function","type":"n8n-nodes-base.function","position":[-280,-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// Loop over inputs and add a new field called 'myNewField' to the JSON of each one\nc_id = items[0].json.headers['x-adobesign-clientid'];\n\nfor (item of items) {\n  item.json.myNewField = 1;\n  item.json.clientID = c_id;\n}\n\nreturn items;"},"typeVersion":1},{"name":"POST","type":"n8n-nodes-base.webhook","position":[-540,-160],"webhookId":"dfe2a7a8-c0f7-41e1-9bf7-15e2b6e98741","parameters":{"path":"test1","options":{},"httpMethod":"POST","responseMode":"responseNode"},"typeVersion":1},{"name":"reg-GET","type":"n8n-nodes-base.webhook","position":[-540,20],"webhookId":"5356a36b-1090-4470-ad87-7cfdb6c18daf","parameters":{"path":"test1","options":{},"responseMode":"responseNode"},"typeVersion":1},{"name":"webhook-response","type":"n8n-nodes-base.respondToWebhook","position":[-100,-80],"parameters":{"options":{"responseHeaders":{"entries":[{"name":"x-adobesign-clientid","value":"={{$node[\"Function\"].json[\"clientID\"]}}"}]}}},"typeVersion":1},{"name":"SetWebhookData","type":"n8n-nodes-base.set","position":[60,-80],"parameters":{"values":{"string":[{"name":"webhookData","value":"={{ $item(\"0\").$node[\"webhook-response\"].json[\"body\"] }}"},{"name":"agreement_ID","value":"={{ $item(\"0\").$node[\"webhook-response\"].json[\"body\"][\"agreement\"][\"id\"] }}"},{"name":"all_participants","value":"={{ $item(\"0\").$node[\"webhook-response\"].json[\"body\"][\"agreement\"][\"participantSetsInfo\"] }}"},{"name":"agreement_status","value":"={{ $item(\"0\").$node[\"webhook-response\"].json[\"body\"][\"agreement\"][\"status\"] }}"}]},"options":{},"keepOnlySet":true},"typeVersion":1}],"connections":{"POST":{"main":[[{"node":"Function","type":"main","index":0}]]},"reg-GET":{"main":[[{"node":"Function","type":"main","index":0}]]},"Function":{"main":[[{"node":"webhook-response","type":"main","index":0}]]},"webhook-response":{"main":[[{"node":"SetWebhookData","type":"main","index":0}]]}}}