Task: Send LinkedIn messages with uProc

n8n workflow JSON:
{"id":"163","name":"uproc_message_to_profile","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[440,300],"parameters":{"values":{"string":[{"name":"profile","value":"https://www.linkedin.com/in/ana-canal-nuri-53498a30/"},{"name":"message","value":"Hi {{first}},\n\nDo you know that you can send LinkedIn messages from https://uproc.io/#/?\nCheck it out!"}]},"options":{}},"typeVersion":1},{"name":"uProc","type":"n8n-nodes-base.uproc","position":[640,300],"parameters":{"tool":"sendLinkedinMessage","message":"={{$node[\"Set\"].json[\"message\"]}}","profile":"={{$node[\"Set\"].json[\"profile\"]}}","additionalOptions":{"dataWebhook":"https://uproc.free.beeceptor.com"}},"credentials":{"uprocApi":"miquel-uproc"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Set":{"main":[[{"node":"uProc","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Set","type":"main","index":0}]]}}}