This article provides a complete, practical walkthrough of the Http Stickynote Create Webhook n8n agent. It connects HTTP Request, Webhook across approximately 1 node(s). Expect a Intermediate setup in 15-45 minutes. One‑time purchase: €29.

What This Agent Does

This agent orchestrates a reliable automation between HTTP Request, Webhook, handling triggers, data enrichment, and delivery with guardrails for errors and rate limits.

It streamlines multi‑step processes that would otherwise require manual exports, spreadsheet cleanup, and repeated API requests. By centralizing logic in n8n, it reduces context switching, lowers error rates, and ensures consistent results across teams.

Typical outcomes include faster lead handoffs, automated notifications, accurate data synchronization, and better visibility via execution logs and optional Slack/Email alerts.

How It Works

The workflow uses standard n8n building blocks like Webhook or Schedule triggers, HTTP Request for API calls, and control nodes (IF, Merge, Set) to validate inputs, branch on conditions, and format outputs. Retries and timeouts improve resilience, while credentials keep secrets safe.

Third‑Party Integrations

• HTTP Request
• Webhook

Import and Use in n8n

1. Open n8n and create a new workflow or collection.
2. Choose Import from File or Paste JSON.
3. Paste the JSON below, then click Import.
4. Show n8n JSON

   Title:  
   Automating Mailing Address Verification in HighLevel Using n8n and Lob API
   
   Meta Description:  
   Learn how to automate mailing address verification for new CRM contacts using n8n and the Lob address verification API. Ensure accurate contact data, improve delivery rates, and optimize outreach with this streamlined workflow.
   
   Keywords:  
   n8n workflow, address verification automation, HighLevel CRM, Lob API, CRM automation, valid mailing address, contact data hygiene, webhooks, contact verification, API workflows
   
   Third-Party APIs Used:
   
   - Lob (https://lob.com): Used for address verification leveraging the /us_verifications endpoint.
   - HighLevel (https://www.gohighlevel.com): CRM platform where contacts are updated based on address validity.
   
   —
   
   Article:
   
   Ensuring contact data accuracy is crucial for effective communication—especially when it comes to physical mailings. Incorrect or undeliverable addresses can cost time and money and reduce the impact of direct outreach efforts. This article walks through an n8n workflow designed to automatically verify new contact mailing addresses in your HighLevel CRM using the Lob address verification API.
   
   Whether you're running marketing campaigns, sending physical gifts, or mailing invoices, this automated address validation system ensures your CRM data stays clean, reliable, and up-to-date.
   
   🛠 Workflow Purpose
   
   The main objective of this n8n automation is to validate mailing addresses as soon as a new contact is added to HighLevel. The automation cross-references inputted address data with the Lob API to determine if the address is deliverable or not. Based on the result, the contact is updated in HighLevel to reflect deliverability, triggering either a manual review process or confirming the address is safe for mail delivery.
   
   📬 Step-by-Step Workflow Explanation
   
   1. CRM Webhook Trigger  
   The process starts with an n8n Webhook node configured to receive POST requests from your CRM (in this case, HighLevel). This webhook is activated anytime a new contact is created or updated with an address.
   
   2. Parsing Address Fields  
   Next, a “Set” node breaks out the received data into individual address fields: street address, address line 2 (if available), city, state, and ZIP code. These fields are formatted in a way that's compatible with Lob’s address verification API.
   
   3. Lob Address Verification API Request  
   The workflow sends an HTTP POST request to Lob's /us_verifications endpoint. This endpoint responds with verification results, including a deliverability status such as "deliverable," "undeliverable," or "deliverable with a warning."
   
   Before using this step, you'll need to:
   - Create an account at https://lob.com
   - Generate an API Key (instructions here: https://help.lob.com/account-management/api-keys)
   - Store these credentials securely in your n8n Basic Auth credentials for use in the HTTP request node
   
   4. Decision Point: Is the Address Deliverable?  
   A “Switch” node checks the deliverability status in the API response:
   - If status is "deliverable," the workflow updates the contact in HighLevel with a tag like “Mailing Address Deliverable.”
   - If not, the workflow applies a “Mailing Address NOT Deliverable” tag in HighLevel.
   
   5. Updating HighLevel  
   Depending on the switch node's output:
   - If the address is verified as deliverable, one HighLevel node updates the contact with a “Deliverable” tag.
   - If the address is not deliverable, a second HighLevel node adds a “NOT Deliverable” tag, which can trigger manual review workflows or automated outreach via HighLevel.
   
   🎯 Customization Tips
   
   The output tagging in HighLevel can be easily customized depending on your internal CRM workflows. For example, instead of just tagging the contact, you could:
   - Update a custom field with the address status
   - Trigger an internal task or workflow for manual validation
   - Use automation to reach out to the contact requesting updated info
   
   👀 Video Overview
   
   For a visual walkthrough of this workflow and how it's used in practice, check out the creator’s Loom video:  
   https://www.loom.com/share/8995ca0b41ce473ebbad9c1973109c0f
   
   🔒 Data Accuracy: More Than Just Clean Records
   
   Beyond just keeping your CRM tidy, verifying mailing addresses has direct financial and customer experience impacts:
   - Reduce the number of returned mailings
   - Avoid costly reprints and resends
   - Ensure higher conversion rates for direct mail campaigns
   - Improve segmentation accuracy in geo-targeted campaigns
   
   🚀 Why Use n8n?
   
   n8n is a powerful open-source automation platform, ideal for stitching together APIs, webhooks, and third-party services like Lob and HighLevel. Through a no-code/low-code interface, you can build advanced workflows like this with logic branching, conditionals, and external service integration.
   
   💡 Final Thoughts
   
   Automating address verification removes a tedious but critical step in data management and ensures you're making informed decisions off clean data. Whether you're a growing business or a large-scale CRM operator, this integration of HighLevel, Lob, and n8n offers a flexible and robust solution to maintain trustworthy contact information—making your outreach smarter, faster, and more cost-efficient.
   
   Start building with this workflow today to level up your CRM game.🧠📬
   
   —
   
   Ready to implement this automation? Create your Lob API key, connect your HighLevel account, and drop this workflow into your n8n instance. You’ll be verifying addresses and optimizing your contact data hygiene in no time.

5. Set credentials for each API node (keys, OAuth) in Credentials.
6. Run a test via Execute Workflow. Inspect Run Data, then adjust parameters.
7. Enable the workflow to run on schedule, webhook, or triggers as configured.

Tips: keep secrets in credentials, add retries and timeouts on HTTP nodes, implement error notifications, and paginate large API fetches.

Validation: use IF/Code nodes to sanitize inputs and guard against empty payloads.

Why Automate This with AI Agents

AI‑assisted automations offload repetitive, error‑prone tasks to a predictable workflow. Instead of manual copy‑paste and ad‑hoc scripts, your team gets a governed pipeline with versioned state, auditability, and observable runs.

n8n’s node graph makes data flow transparent while AI‑powered enrichment (classification, extraction, summarization) boosts throughput and consistency. Teams reclaim time, reduce operational costs, and standardize best practices without sacrificing flexibility.

Compared to one‑off integrations, an AI agent is easier to extend: swap APIs, add filters, or bolt on notifications without rewriting everything. You get reliability, control, and a faster path from idea to production.

Best Practices

• Credentials: restrict scopes and rotate tokens regularly.
• Resilience: configure retries, timeouts, and backoff for API nodes.
• Data Quality: validate inputs; normalize fields early to reduce downstream branching.
• Performance: batch records and paginate for large datasets.
• Observability: add failure alerts (Email/Slack) and persistent logs for auditing.
• Security: avoid sensitive data in logs; use environment variables and n8n credentials.

FAQs

Can I swap integrations later? Yes. Replace or add nodes and re‑map fields without rebuilding the whole flow.

How do I monitor failures? Use Execution logs and add notifications on the Error Trigger path.

Does it scale? Use queues, batching, and sub‑workflows to split responsibilities and control load.

Is my data safe? Keep secrets in Credentials, restrict token scopes, and review access logs.