# Set the order external reference in the InLine Cart

## Overview

Use the Cart object to set **order external reference** of the InLine Cart by calling the `TwoCoInlineCart.cart.setOrderExternalRef(your-external-reference)` method.

## Use case

1. Add an HTML link or button in your page like the one below.
2. Create a JavaScript click handler to execute the Inline Client desired methods.
3. Use the`TwoCoInlineCart.products.add({code, quantity, options})`method to prepare your catalog product.
4. In order to set currency use TwoCoInlineCart.cart.setCurrency(currency-code).
5. In order to set order external reference use`TwoCoInlineCart.cart.setOrderExternalRef(your-external-reference)`method.
6. You can see below a signature token request payload for this example. A success response contains a JSON with the property “signature“ which needs to be used at the next step to set the signature using the TwoCoInlineCart method.<br>

   ```json
   {
       "merchant": "AVLRNG",
       "currency": "USD",
       "products": [
           {
               "code": "74B8E17CC0"
           }
       ],
       "reference": {
           "external": {
               "order": "test-order-external-ref"
           }
       }
   }
   ```

   \
   The above payload will generate the signature f40503a3feeb2c5fc0ca002ded20c59ad0f0b439e3911cfb03538906635d0ae4.
7. Use the TwoCoInlineCart.cart.setSignature('f40503a3feeb2c5fc0ca002ded20c59ad0f0b439e3911cfb03538906635d0ae4') method to set the signature.
8. Use the`TwoCoInlineCart.cart.checkout()`method to show the cart on your page.

## Sample request

### HTML

```html
<a href="#" class="btn btn-success" id="buy-button">Buy now!</a>
```

### Javascript

```javascript
window.document.getElementById('buy-button').addEventListener('click', function() {
  TwoCoInlineCart.cart.setCurrency('USD');
  TwoCoInlineCart.products.add({
    code: "74B8E17CC0"
  });
  TwoCoInlineCart.cart.setSignature('f40503a3feeb2c5fc0ca002ded20c59ad0f0b439e3911cfb03538906635d0ae4');
  TwoCoInlineCart.cart.setOrderExternalRef('test-order-external-ref');
  TwoCoInlineCart.cart.checkout();
});
```

## Demo

After setting the order external reference in the InLine cart using the above method, your cart should look like this:

{% embed url="<https://codepen.io/2checkout-documentation/pen/mZJLjq>" %}


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