Monitor if a page is alive and notify via Twilio SMS if not

Workflow Purpose This workflow periodically checks a service's availability and sends an SMS notification if the service is down. High-Level Steps Schedule Trigger: The workflow is triggered at a specified interval, such as every minute. HTTP Request: An HTTP request is sent to the URL of the service being monitored. If: The HTTP status code of the response is checked. If the status code is 200 (OK), the workflow ends. If the status code is not 200, indicating a potential issue, an SMS notification is sent using Twilio. Setup Setting up this workflow is relatively straightforward and should only take a few minutes: Create a new n8n workflow. Add the nodes: Schedule Trigger, HTTP Request, If,

Help me set up the n8n workflow "Monitor if a page is alive and notify via Twilio SMS if not" (https://n8n.io/workflows/2524). It uses: HTTP Request, Twilio. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.