# Learn API Fundamentals with Interactive Hands-On Tutorial: n8n workflow

> Started by another system calling it. It calls services over plain HTTP rather than through connectors.

Source: https://millionrounds.com/workflow/learn-api-fundamentals-with-interactive-hands-on-tutorial (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Setup and learning](https://millionrounds.com/workflows?category=Setup+and+learning#library)

# Learn API Fundamentals with Interactive Hands-On Tutorial

Started by another system calling it. It calls services over plain HTTP rather than through connectors. 23 steps, 2 branches, 1 loop or waits: large, and worth reading before you trust it with anything live.

Large

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Flearn-api-fundamentals-with-interactive-hands-on-tutorial)

**23 steps** Large: read it before trusting it with anything live

**2** Branches: places the flow splits

**1** Loop or waits

**0** Services by connector: it calls them over plain HTTP

## The flow

Starts it 8 Logic 10 Service 5

The steps in the order they run, from what starts it.

- 1 **Start Tutorial** Manual trigger *Starts it*
- 2 **1. The Kitchen (GET /menu)** Webhook *Starts it*
- 3 **2. The Kitchen (GET /order)** Webhook *Starts it*
- 4 **3. The Kitchen (POST /review)** Webhook *Starts it*
- 5 **4. The Kitchen (GET /secret-dish)** Webhook *Starts it*
- 6 **5. The Kitchen (GET /slow-service)** Webhook *Starts it*
- 7 **⚙️CONFIGURATION⚙️** Set *Logic*
- 8 **Prepare Menu Data** Set *Logic*
- 9 **IF extra cheese** If *Logic*
- 10 **Process Review Data** Set *Logic*
- 11 **IF Authorized** If *Logic*
- 12 **Wait 3 seconds** Wait *Logic*
- 13 **Base URL** Set *Logic*
- 14 **Prepare Cheese Pizza** Set *Logic*
- 15 **Prepare Plain Pizza** Set *Logic*
- 16 **Respond with Secret** Respond To Webhook *Starts it*
- 17 **Respond: Unauthorized (401)** Respond To Webhook *Starts it*
- 18 **Prepare Slow Response** Set *Logic*
- 19 **1. The Customer (GET Menu Item)** Http Request *Service*
- 20 **2. The Customer (GET with Query Params)** Http Request *Service*
- 21 **3. The Customer (POST with Body)** Http Request *Service*
- 22 **4. The Customer (GET with Headers/Auth)** Http Request *Service*
- 23 **5. The Customer (Request with Timeout)** Http Request *Service*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 23, with 2 branches, 1 loop or waits
- **Size:** Large: read it before trusting it with anything live
- **Connects to:** Nothing by connector; it calls services over plain HTTP
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Take your time. At 23 steps it is large: read it before trusting it with anything live.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 23 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Flearn-api-fundamentals-with-interactive-hands-on-tutorial)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Workflows like it

Also setup and learning, with the same services where possible, closest in size first.

- [**Asana tool MCP server all 22 operations** 23 steps](https://millionrounds.com/workflow/asana-tool-mcp-server-all-22-operations)
- [**Search Slack for n8n templates with OpenAI and Google Sheets** 23 steps · Google Sheets, Slack](https://millionrounds.com/workflow/search-slack-for-n8n-templates-with-openai-and-google-sheets)
- [**Twist Tool MCP server all 22 operations** 23 steps](https://millionrounds.com/workflow/twist-tool-mcp-server-all-22-operations)
- [**Action Network tool MCP server all 23 operations** 24 steps](https://millionrounds.com/workflow/action-network-tool-mcp-server-all-23-operations)
- [**Close tickets faster Zammad tool MCP server all 20 operations** 22 steps](https://millionrounds.com/workflow/close-tickets-faster-zammad-tool-mcp-server-all-20-operation)
- [**Complete Zendesk API integration with MCP** 24 steps](https://millionrounds.com/workflow/complete-zendesk-api-integration-with-mcp)