WooCommerce PDF Watermark

Here's how you can add a watermark image using this plugin:

### Option 1: Using the WooCommerce PDF Invoices & Packing Slips Plugin

#### Step 1: Install the Plugin
1. Go to your WordPress dashboard.
2. Navigate to **Plugins > Add New**.
3. Search for **"WooCommerce PDF Invoices & Packing Slips"**.
4. Click **Install** and then **Activate**.

#### Step 2: Add the Watermark Image
1. Once the plugin is activated, go to **WooCommerce > PDF Invoices**.
2. Go to the **Documents** tab and select **Invoice**.
3. Click on the **Customize** button to enter the PDF template customization.
4. In the **Template Customizer**:
– You can add a **background image** that acts as a watermark:
– Go to **General** settings (usually at the top left of the editor).
– Click on **Background Image** and upload your watermark image.
– Adjust the size and opacity if necessary.

#### Step 3: Save the Changes
1. After adding your watermark image, click the **Save** button.
2. Generate a sample PDF invoice to test if the watermark appears correctly.

### Option 2: Using Custom Code (D

Here’s how you can add a watermark to your invoices using custom code:

### Adding a Watermark Using Custom Code

1. **Locate the Theme's `functions.php` File**:
– Go to your WordPress dashboard.
– Navigate to **Appearance > Theme File Editor**.
– Open the `functions.php` file of your active theme (preferably use a child theme to avoid losing changes during updates).

2. **Add the Custom Function**:
– Copy and paste the following code into your `functions.php` file:

add_action('wpo_wcpdf_after_document', 'add_watermark_to_pdf', 10, 2);

   function add_watermark_to_pdf($document_type, $document) {
       if ($document_type === 'invoice') {
           $pdf = $document->get_pdf();
           $page_count = $pdf->get_page_count();
           
           for ($i = 1; $i <= $page_count; $i++) {
               $pdf->set_page($i);
               $pdf->SetAlpha(0.1); // Adjust transparency (0.0 = fully transparent, 1.0 = fully opaque)
               $watermark_image = 'path/to/your/watermark.png';
               $pdf->Image($watermark_image, 10, 40, 180); // Adjust position (x, y) and size (width)
               $pdf->SetAlpha(1);
           }
       }
   }

**Explanation**:
– This function hooks into the PDF generation process and adds a watermark image to every page of the PDF invoice.
– Make sure to adjust the path to your watermark image (`path/to/your/watermark.png`) with the actual URL or relative path of your watermark file.
– You can adjust the transparency, position, and size of the watermark by modifying the `SetAlpha` and `Image` method parameters.

3. **Upload the Watermark Image**:
– Make sure the watermark image (`watermark.png`) is uploaded to your WordPress media library or your theme directory.

4. **Test the Changes**:
– Go to **WooCommerce > Orders**.
– Open an order and generate a PDF invoice to see if the watermark appears correctly.

### Notes
– Ensure you have a backup of your site before making any changes to the `functions.php` file.
– If you are using a caching plugin, clear your cache after making changes.
– The premium version of the WooCommerce PDF Invoices plugin may offer more flexibility and built-in support for watermarks if you want a more robust solution.

Let me know if you need further customization or if you encounter any issues!