External Product Button Change

### Steps:

1. **Identify Product Type**
WooCommerce identifies external products by the product type `external`.

2. **Hook into WooCommerce Loop**
Use the `woocommerce_loop_add_to_cart_link` filter to modify the button or link displayed for external products.

3. **Replace the Button**
Check the product type in the loop and display the appropriate button or link.

### Code Example

Add the following code to your theme's `functions.php` file:

add_filter('woocommerce_loop_add_to_cart_link', 'custom_add_to_cart_button_for_external', 10, 2);

function custom_add_to_cart_button_for_external($button, $product) {
    if ($product->is_type('external')) {
        // Get the external product URL
        $product_url = $product->get_product_url();

        // Customize the button HTML
        $button = sprintf(
            '<a href="%s" target="_blank" rel="nofollow" class="button">%s</a>',
            esc_url($product_url),
            esc_html__('View Product', 'woocommerce') // Customize the button text
        );
    }

    return $button;
}

### Explanation

1. **Hook Used**: `woocommerce_loop_add_to_cart_link` is used to filter the "Add to Cart" button for products in the shop loop.
2. **Product Type Check**: `$product->is_type('external')` checks if the product is of type `external`.
3. **Get External URL**: `$product->get_product_url()` fetches the external URL set in the product settings.
4. **Customize Button**: The button is replaced with an “ tag linking to the external product URL.

### Outcome

– For **external products**, the "Add to Cart" button will be replaced with a "View Product" link.
– The link will open the external URL in a new tab.

### Notes

– Make sure you have set the product type to **External/Affiliate** and added the external URL in the product settings.
– You can customize the button text and styling as per your theme requirements.