# How-to Guides

## Adding a Customer

Almost all scenarios start by creating a Customer with a Site.

**Step 1:** Use the `POST /customers` endpoint to create a customer with their initial site.

**Step 2 (Optional):** If there are additional sites, use `POST /sites` to create them.

**Example Request Body:**


```json
{
  "customerName": "Example Company Ltd",
  "customerReference": "CUST001",
  "sites": [
    {
      "siteName": "Head Office",
      "addressLine1": "123 Main Street",
      "city": "London",
      "postcode": "SW1A 1AA"
    }
  ]
}
```

Once you have a customer, the next step is to [add the products and services](/pages/howtoguides/add-products) sold to this customer as inventory items.