Task: Send a message on Mattermost when a lead replies to your Lemlist email

n8n workflow JSON:
{"nodes":[{"name":"Lemlist Trigger","type":"n8n-nodes-base.lemlistTrigger","position":[410,160],"webhookId":"e1e29f99-7222-488a-826f-5af50ffe7505","parameters":{"event":"emailsReplied","options":{"campaignId":"cam_H5pYEryq6mRKBiy5v"}},"credentials":{"lemlistApi":"Lemlist API Credentials"},"typeVersion":1},{"name":"Mattermost","type":"n8n-nodes-base.mattermost","position":[610,160],"parameters":{"message":"={{$json[\"firstName\"]}} has replied back to your {{$json[\"campaignName\"]}}. Below is the reply:\n> {{$json[\"text\"]}}","channelId":"qx9yo1i9z3bg5qcy5a1oxnh69c","attachments":[],"otherOptions":{}},"credentials":{"mattermostApi":"Mattermost Credentials"},"typeVersion":1}],"connections":{"Lemlist Trigger":{"main":[[{"node":"Mattermost","type":"main","index":0}]]}}}