Add Terms section to WooCommerce PDF Invoice

gistfile1.php

/**
 * Adding terms and conditions area to the invoice
 *
 * Uses template tag [[PDFTERMSCONDITIONS]]
 *
 * settings field name : woocommerce_pdf_invoice_settings[invoice_terms]
 * 
 * 1 - Edit template.php and add the tag in the desired place
 * 2 - add code to the theme functions.php file
 * 3 - add text in PDF Invoice settings
 */
add_action ( 'woocommerce_pdf_invoice_additional_fields_admin' , 'additional_fields_admin_terms' );
function additional_fields_admin_terms() {

  $woocommerce_pdf_invoice_options = get_option('woocommerce_pdf_invoice_settings');
	?>
			<!-- Terms and Conditions -->
            <tr valign="top">
                <th scope="row" class="titledesc">
                    <label for="woocommerce_pdf_invoice_settings[invoice_terms]">Invoice Terms and Conditions</label>
                    <img class="help_tip" data-tip="Add some custom text to your invoice" src="<?php echo plugins_url( 'woocommerce/assets/images/help.png' );?>" height="16" width="16" />                 
                </th>
                <td class="forminp forminp-number">
                    <textarea id="woocommerce_pdf_invoice_settings[invoice_terms]" 
                    name="woocommerce_pdf_invoice_settings[invoice_terms]" 
                    value=""
                    placeholder="" style="width: 350px;"/><?php if ( isset($woocommerce_pdf_invoice_options['invoice_terms']) ) { echo $woocommerce_pdf_invoice_options['invoice_terms']; }?></textarea>                     
                </td>
            </tr>
	<?php

} 

add_filter ( 'pdf_content_additional_content' , 'pdf_additional_content_terms' );
function pdf_additional_content_terms( $content ) {
	
	$woocommerce_pdf_invoice_options = get_option('woocommerce_pdf_invoice_settings');
	if ( isset($woocommerce_pdf_invoice_options['invoice_terms']) ) :
		$content = str_replace( '[[PDFTERMSCONDITIONS]]', $woocommerce_pdf_invoice_options['invoice_terms'], $content );	
	endif;
	
    return $content;
	
}

/* Close terms and conditions */