This workflow follows the HTTP Request → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"nodes": [
{
"id": "sa-note",
"name": "Section 1 note",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-460,
-160
],
"parameters": {
"content": "## 1. Booking confirmed on the spot\n- A new booking lands, the customer is saved in GoHighLevel with their appointment time, and the confirmation text goes out right away.",
"height": 140,
"width": 620,
"color": 4
}
},
{
"id": "sa-hook",
"name": "A new appointment gets booked",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
-420,
80
],
"parameters": {
"httpMethod": "POST",
"path": "demo/appointment-booked",
"responseMode": "responseNode",
"options": {}
}
},
{
"id": "sa-tidy",
"name": "Tidy up the booking details",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
-200,
80
],
"parameters": {
"jsCode": "// Booking events arrive in a few different shapes, so check each one in turn.\nconst TZ = 'America/Denver';\n\nconst results = [];\n\nfor (const item of $input.all()) {\n const raw = item.json || {};\n const body = raw.body || {};\n const custom = raw.customData || body.customData || {};\n const contact = raw.contact || body.contact || {};\n const sources = [raw, body, custom, contact];\n\n const pick = (...keys) => {\n for (const key of keys) {\n for (const source of sources) {\n if (!source || typeof source !== 'object') continue;\n const value = source[key];\n if (value === undefined || value === null) continue;\n const text = String(value).trim();\n if (text !== '') return text;\n }\n }\n return '';\n };\n\n const fullName = pick('name', 'full_name', 'fullName', 'customerName', 'customer_name');\n const firstName = pick('firstName', 'first_name') || fullName.split(' ')[0] || 'there';\n\n let phone = pick('phone', 'phoneNumber', 'phone_number', 'mobile', 'customerPhone');\n phone = phone.replace(/[^0-9+]/g, '');\n if (phone && !phone.startsWith('+')) {\n phone = phone.length === 10 ? '+1' + phone : '+' + phone;\n }\n\n const appointmentTime = pick('appointmentTime', 'appointment_time', 'startTime', 'start_time', 'start', 'apptTime');\n const apptDate = new Date(appointmentTime);\n const validDate = appointmentTime && !isNaN(apptDate.getTime());\n\n const dayPretty = validDate\n ? apptDate.toLocaleDateString('en-US', { timeZone: TZ, weekday: 'long', month: 'long', day: 'numeric' })\n : 'your scheduled day';\n const timePretty = validDate\n ? apptDate.toLocaleTimeString('en-US', { timeZone: TZ, hour: 'numeric', minute: '2-digit' })\n : 'the scheduled time';\n\n results.push({\n json: {\n fullName: fullName || firstName,\n firstName,\n phone,\n contactId: pick('contactId', 'contact_id', 'id'),\n appointmentTime,\n jobType: pick('jobType', 'job_type', 'service', 'serviceType') || 'service visit',\n dayPretty,\n timePretty\n }\n });\n}\n\nreturn results;\n"
}
},
{
"id": "sa-save",
"name": "Save the customer in GoHighLevel",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
20,
80
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/contacts/upsert",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ locationId: 'bsHomeSvcDemo01', firstName: $json.firstName, name: $json.fullName, phone: $json.phone, tags: ['appt-confirmed'], customFields: [{ key: 'appointment_time', field_value: $json.appointmentTime }] }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "sa-sms",
"name": "Text the booking confirmation",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
240,
80
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/conversations/messages",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ type: 'SMS', contactId: $json.contact?.id || $('Tidy up the booking details').item.json.contactId, message: 'Hey ' + $('Tidy up the booking details').item.json.firstName + ', this is Blue Summit. You are on the books for ' + $('Tidy up the booking details').item.json.dayPretty + ' at ' + $('Tidy up the booking details').item.json.timePretty + '. We will text you a heads up before we head over.' }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "sa-respond",
"name": "Tell the calendar it is booked",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
460,
80
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ ok: true, message: 'Booked and the confirmation text has gone out.', phone: $('Tidy up the booking details').item.json.phone }) }}",
"options": {}
}
},
{
"id": "sb-note",
"name": "Section 2 note",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-460,
480
],
"parameters": {
"content": "## 2. The reminder sweep\n- Every fifteen minutes the sweep finds who is about a day out or about two hours out and sends the right text.\n- Both timing windows sit at the top of one code node, so moving a reminder is a one line change.",
"height": 160,
"width": 620,
"color": 4
}
},
{
"id": "sb-schedule",
"name": "Check every fifteen minutes",
"type": "n8n-nodes-base.scheduleTrigger",
"typeVersion": 1.2,
"position": [
-420,
760
],
"parameters": {
"rule": {
"interval": [
{
"field": "minutes",
"minutesInterval": 15
}
]
}
}
},
{
"id": "sb-list",
"name": "Get everyone with an appointment on the books",
"type": "n8n-nodes-base.highLevel",
"typeVersion": 2,
"position": [
-200,
760
],
"parameters": {
"resource": "contact",
"operation": "getAll",
"returnAll": true,
"filters": {}
},
"credentials": {
"highLevelOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"id": "sb-code",
"name": "Work out who is due a text now",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
20,
760
],
"parameters": {
"jsCode": "// Change the reminder timing here. Minutes count down to the appointment.\nconst RULES = [\n { due: 'day_before', stampTag: 'reminder-24h-sent', fromMinutes: 22 * 60, toMinutes: 26 * 60 },\n { due: 'morning_of', stampTag: 'reminder-2h-sent', fromMinutes: 90, toMinutes: 150 }\n];\n\nconst TZ = 'America/Denver';\n\nfunction tagsOf(contact) {\n const raw = contact.tags ?? contact.tag ?? [];\n const list = Array.isArray(raw) ? raw : String(raw).split(',');\n return list.map(t => String(t).trim().toLowerCase()).filter(t => t.length > 0);\n}\n\nfunction toUsNumber(raw) {\n let digits = String(raw ?? '').replace(/[^0-9+]/g, '');\n if (!digits) return '';\n if (digits.startsWith('+')) return digits;\n if (digits.length === 10) return '+1' + digits;\n return '+' + digits;\n}\n\nfunction apptTimeOf(contact) {\n const direct = contact.appointment_time || contact.appointmentTime || contact.apptTime;\n if (direct) return String(direct);\n const lists = [contact.customFields, contact.customField, contact.custom_fields];\n for (const list of lists) {\n if (!Array.isArray(list)) continue;\n for (const field of list) {\n if (!field || typeof field !== 'object') continue;\n const key = String(field.key || field.fieldKey || field.name || '').toLowerCase();\n if (!key.includes('appointment')) continue;\n const value = field.value ?? field.field_value ?? field.fieldValue;\n if (value) return String(value);\n }\n }\n return '';\n}\n\nconst now = Date.now();\nconst due = [];\n\nfor (const item of $input.all()) {\n const contact = item.json ?? {};\n const tags = tagsOf(contact);\n\n // The tags are the memory. Whoever already has the stamp tag is skipped,\n // so a restart never sends anyone the same reminder twice.\n if (!tags.includes('appt-confirmed')) continue;\n if (tags.includes('no-show')) continue;\n\n const apptRaw = apptTimeOf(contact);\n if (!apptRaw) continue;\n const apptMs = new Date(apptRaw).getTime();\n if (isNaN(apptMs)) continue;\n\n const minutesToGo = (apptMs - now) / 60000;\n const rule = RULES.find(r => minutesToGo >= r.fromMinutes && minutesToGo <= r.toMinutes);\n if (!rule) continue;\n if (tags.includes(rule.stampTag)) continue;\n\n const phone = toUsNumber(contact.phone ?? contact.phoneNumber ?? contact.mobile);\n if (!phone) continue;\n\n const contactId = contact.id ?? contact.contactId ?? contact._id;\n if (!contactId) continue;\n\n const apptDate = new Date(apptMs);\n due.push({\n json: {\n contactId,\n firstName: contact.firstName ?? contact.first_name ?? contact.contactName ?? 'there',\n phone,\n due: rule.due,\n stampTag: rule.stampTag,\n dayPretty: apptDate.toLocaleDateString('en-US', { timeZone: TZ, weekday: 'long', month: 'long', day: 'numeric' }),\n timePretty: apptDate.toLocaleTimeString('en-US', { timeZone: TZ, hour: 'numeric', minute: '2-digit' })\n }\n });\n}\n\n// Nobody in a window right now means the sweep just ends quietly.\nreturn due;\n"
}
},
{
"id": "sb-switch",
"name": "Which reminder is due?",
"type": "n8n-nodes-base.switch",
"typeVersion": 3.2,
"position": [
240,
760
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose",
"version": 2
},
"conditions": [
{
"leftValue": "={{ $json.due }}",
"rightValue": "day_before",
"operator": {
"type": "string",
"operation": "equals"
}
}
],
"combinator": "and"
},
"outputKey": "day_before"
},
{
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose",
"version": 2
},
"conditions": [
{
"leftValue": "={{ $json.due }}",
"rightValue": "morning_of",
"operator": {
"type": "string",
"operation": "equals"
}
}
],
"combinator": "and"
},
"outputKey": "morning_of"
}
]
},
"options": {
"fallbackOutput": "none"
}
}
},
{
"id": "sb-sms-daybefore",
"name": "Text the day before reminder",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
460,
660
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/conversations/messages",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ type: 'SMS', contactId: $json.contactId, message: 'Hey ' + $json.firstName + ', Blue Summit here. We have you down for tomorrow at ' + $json.timePretty + '. Reply here if anything changes.' }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "sb-sms-morning",
"name": "Text the morning of heads up",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
460,
860
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/conversations/messages",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ type: 'SMS', contactId: $json.contactId, message: 'Morning ' + $json.firstName + ', Blue Summit here. Our tech is headed your way around ' + $json.timePretty + ' today. See you soon.' }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "sb-stamp",
"name": "Mark the reminder as sent",
"type": "n8n-nodes-base.highLevel",
"typeVersion": 2,
"position": [
700,
760
],
"parameters": {
"resource": "contact",
"operation": "update",
"contactId": "={{ $('Work out who is due a text now').item.json.contactId }}",
"updateFields": {
"tags": "={{ $('Work out who is due a text now').item.json.stampTag }}"
}
},
"credentials": {
"highLevelOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"id": "sc-note",
"name": "Section 3 note",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-460,
1160
],
"parameters": {
"content": "## 3. No-show rescue\n- A no-show gets a low pressure rebook text with the booking link the same day.\n- The office gets a call task for tomorrow and a note in #sales-team, so nobody falls through the cracks.",
"height": 160,
"width": 620,
"color": 4
}
},
{
"id": "sc-hook",
"name": "The calendar marks a no-show",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
-420,
1440
],
"parameters": {
"httpMethod": "POST",
"path": "demo/no-show",
"responseMode": "responseNode",
"options": {}
}
},
{
"id": "sc-tidy",
"name": "Tidy up the no-show details",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
-200,
1440
],
"parameters": {
"jsCode": "// No-show events arrive in a few different shapes, so check each one in turn.\nconst results = [];\n\nfor (const item of $input.all()) {\n const raw = item.json || {};\n const body = raw.body || {};\n const custom = raw.customData || body.customData || {};\n const contact = raw.contact || body.contact || {};\n const sources = [raw, body, custom, contact];\n\n const pick = (...keys) => {\n for (const key of keys) {\n for (const source of sources) {\n if (!source || typeof source !== 'object') continue;\n const value = source[key];\n if (value === undefined || value === null) continue;\n const text = String(value).trim();\n if (text !== '') return text;\n }\n }\n return '';\n };\n\n const fullName = pick('name', 'full_name', 'fullName', 'customerName', 'customer_name');\n const firstName = pick('firstName', 'first_name') || fullName.split(' ')[0] || 'there';\n\n let phone = pick('phone', 'phoneNumber', 'phone_number', 'mobile', 'customerPhone');\n phone = phone.replace(/[^0-9+]/g, '');\n if (phone && !phone.startsWith('+')) {\n phone = phone.length === 10 ? '+1' + phone : '+' + phone;\n }\n\n results.push({\n json: {\n contactId: pick('contactId', 'contact_id', 'id'),\n fullName: fullName || firstName,\n firstName,\n phone\n }\n });\n}\n\nreturn results;\n"
}
},
{
"id": "sc-tag",
"name": "Tag them as a no-show",
"type": "n8n-nodes-base.highLevel",
"typeVersion": 2,
"position": [
20,
1440
],
"parameters": {
"resource": "contact",
"operation": "update",
"contactId": "={{ $json.contactId }}",
"updateFields": {
"tags": "no-show"
}
},
"credentials": {
"highLevelOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"id": "sc-sms",
"name": "Text them a way to grab a new time",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
240,
1440
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/conversations/messages",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ type: 'SMS', contactId: $('Tidy up the no-show details').item.json.contactId, message: 'Hey ' + $('Tidy up the no-show details').item.json.firstName + ', this is Blue Summit. Sorry we missed each other today. Want to grab a new time? Book here: https://blue-summit.example.com/book' }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "sc-task",
"name": "Give the office a call task for tomorrow",
"type": "n8n-nodes-base.highLevel",
"typeVersion": 2,
"position": [
460,
1440
],
"parameters": {
"resource": "task",
"operation": "create",
"contactId": "={{ $('Tidy up the no-show details').item.json.contactId }}",
"title": "=Call {{ $('Tidy up the no-show details').item.json.fullName }} if they have not rebooked",
"dueDate": "={{ $now.plus({ days: 1 }).toISO() }}",
"additionalFields": {
"description": "=They missed today's visit and got the rebook text. If there is no new appointment on the calendar, give them a call at {{ $('Tidy up the no-show details').item.json.phone }}."
}
},
"credentials": {
"highLevelOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"id": "sc-slack",
"name": "Let the sales team know",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.3,
"position": [
680,
1440
],
"parameters": {
"resource": "message",
"operation": "post",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "name",
"value": "#sales-team"
},
"text": "=No-show today: {{ $('Tidy up the no-show details').item.json.fullName }} ({{ $('Tidy up the no-show details').item.json.phone }}). The rebook text went out and the office has a call task for tomorrow in case they do not grab a new time.",
"otherOptions": {}
},
"credentials": {
"slackApi": {
"name": "<your credential>"
}
}
},
{
"id": "sc-respond",
"name": "Tell the calendar it is handled",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
900,
1440
],
"parameters": {
"respondWith": "json",
"responseBody": "={{ JSON.stringify({ ok: true, message: 'No-show handled. The rebook text went out and the office has a follow up task.', phone: $('Tidy up the no-show details').item.json.phone }) }}",
"options": {}
}
}
],
"connections": {
"A new appointment gets booked": {
"main": [
[
{
"node": "Tidy up the booking details",
"type": "main",
"index": 0
}
]
]
},
"Tidy up the booking details": {
"main": [
[
{
"node": "Save the customer in GoHighLevel",
"type": "main",
"index": 0
}
]
]
},
"Save the customer in GoHighLevel": {
"main": [
[
{
"node": "Text the booking confirmation",
"type": "main",
"index": 0
}
]
]
},
"Text the booking confirmation": {
"main": [
[
{
"node": "Tell the calendar it is booked",
"type": "main",
"index": 0
}
]
]
},
"Check every fifteen minutes": {
"main": [
[
{
"node": "Get everyone with an appointment on the books",
"type": "main",
"index": 0
}
]
]
},
"Get everyone with an appointment on the books": {
"main": [
[
{
"node": "Work out who is due a text now",
"type": "main",
"index": 0
}
]
]
},
"Work out who is due a text now": {
"main": [
[
{
"node": "Which reminder is due?",
"type": "main",
"index": 0
}
]
]
},
"Which reminder is due?": {
"main": [
[
{
"node": "Text the day before reminder",
"type": "main",
"index": 0
}
],
[
{
"node": "Text the morning of heads up",
"type": "main",
"index": 0
}
]
]
},
"Text the day before reminder": {
"main": [
[
{
"node": "Mark the reminder as sent",
"type": "main",
"index": 0
}
]
]
},
"Text the morning of heads up": {
"main": [
[
{
"node": "Mark the reminder as sent",
"type": "main",
"index": 0
}
]
]
},
"The calendar marks a no-show": {
"main": [
[
{
"node": "Tidy up the no-show details",
"type": "main",
"index": 0
}
]
]
},
"Tidy up the no-show details": {
"main": [
[
{
"node": "Tag them as a no-show",
"type": "main",
"index": 0
}
]
]
},
"Tag them as a no-show": {
"main": [
[
{
"node": "Text them a way to grab a new time",
"type": "main",
"index": 0
}
]
]
},
"Text them a way to grab a new time": {
"main": [
[
{
"node": "Give the office a call task for tomorrow",
"type": "main",
"index": 0
}
]
]
},
"Give the office a call task for tomorrow": {
"main": [
[
{
"node": "Let the sales team know",
"type": "main",
"index": 0
}
]
]
},
"Let the sales team know": {
"main": [
[
{
"node": "Tell the calendar it is handled",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
highLevelOAuth2ApihttpHeaderAuthslackApi
Pro
For the full experience including quality scoring and batch install features for each workflow upgrade to Pro
About this workflow
Appointment-Reminders-Noshow. Uses httpRequest, highLevel, slack. Webhook trigger; 22 nodes.
Source: https://github.com/mcruz1799/automation-examples/blob/main/claude-code/02-automation-file-factory/skills/n8n/section-templates/appointment-reminders-noshow.json — original creator credit. Request a take-down →
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