> For the complete documentation index, see [llms.txt](https://developer.esw.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.esw.com/getting-started/get-started-with-esw/readme-1/postman-collection.md).

# Postman Collection

### Get the Postman collection

Postman is the fastest way to explore the sandbox flow.

1. Install [Postman](https://www.getpostman.com/downloads/)
2. Import the files below.
3. Select the imported environment.
4. Run the requests in order `(token → PreOrder → redirect)`

Our Postman collection contains a series of Checkout API calls that are made during a typical Checkout session. The URLs in these environments point to the Integration Layer Proxy, which further points to GoCasual by default. Note that each environment contains STS tokens for the equivalent GoCasual API.

**Collection** (requests)

{% file src="/files/gGjk9sLNbPezX9HQAgzB" %}

**Environment** (variables)

{% file src="/files/1nIW6uTGFgmaDGoj0bEt" %}

### Try Checkout end-to-end

#### Test credentials (sandbox)

Use these values when requesting an STS token in sandbox.

| Field           | Value                                                       |
| --------------- | ----------------------------------------------------------- |
| Token URL       | `https://security-sts.sandbox.eshopworld.com/connect/token` |
| `grant_type`    | `client_credentials`                                        |
| `scope`         | `checkout.preorder.api.all`                                 |
| `client_id`     | `gocas.checkout.client`                                     |
| `client_secret` | Provided by ESW                                             |

{% stepper %}
{% step %}

#### Get an STS access token

Use the same pattern as on [Access Tokens](/getting-started/get-started-with-esw/readme/publish-your-docs.md).

```sh
curl --location --request POST "https://security-sts.sandbox.eshopworld.com/connect/token" \
  --header "Content-Type: application/x-www-form-urlencoded" \
  --data-urlencode "grant_type=client_credentials" \
  --data-urlencode "scope=checkout.preorder.api.all" \
  --data-urlencode "client_id=<client_id>" \
  --data-urlencode "client_secret=<client_secret>"
```

**Sample response**

```json
{
  "access_token": "<jwt>",
  "expires_in": 3600,
  "token_type": "Bearer",
  "scope": "checkout.preorder.api.all"
}
```

{% endstep %}

{% step %}

#### Create a PreOrder

Use the `access_token` from the previous step.

{% code expandable="true" %}

```sh
curl --location --request POST "https://checkout-api-gocas.sandbox.eshopworld.com/api/v2/PreOrder" \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <access_token>" \
  --data-raw '{
    "retailerCartId": "Sample123",
    "cartItems": [
      {
        "quantity": 2,
        "product": {
          "productCode": "1234567890",
          "title": "Black Dress",
          "description": "Black Striped Dress",
          "shopperCurrencyProductPriceInfo": { "price": "AUD3.33" },
          "imageUrl": "assets/images/cart/cart-item10.png",
          "color": "Black",
          "size": "M"
        },
        "cartGrouping": "Group 1"
      }
    ],
    "shopperCurrencyIso": "AUD",
    "retailerCurrencyIso": "EUR",
    "deliveryCountryIso": "AU"
  }'
```

{% endcode %}

**Sample API Response**

```json
{
  "preOrderCode": "e23afa68-9675-4012-8d63-df1517c624cc",
  "orderNumber": "e23afa68-9675-4012-8d63-df1517c624cc",
  "redirectUrl": "https://checkout-ui.sandbox.eshopworld.com/au/e23afa68-9675-4012-8d63-df1517c624cc"
}
```

{% endstep %}

{% step %}

#### Open Checkout

Open `redirectUrl` in a browser.
{% endstep %}
{% endstepper %}

### Troubleshooting

* `401/403`: token missing, expired, or wrong `scope`. See [Authentication](/getting-started/get-started-with-esw/readme/quickstart.md).
* `400`: request body validation failed. Start by reducing to one item.
* Slow responses / timeouts: follow [API best practices](/getting-started/get-started-with-esw/best-practices/apis.md).


---

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