function edd_ajax_store_payment_note()
{
    $payment_id = absint($_POST['payment_id']);
    $note = wp_kses($_POST['note'], array());
    if (!current_user_can('edit_shop_payments', $payment_id)) {
        wp_die(__('You do not have permission to edit this payment record', 'easy-digital-downloads'), __('Error', 'easy-digital-downloads'), array('response' => 403));
    }
    if (empty($payment_id)) {
        die('-1');
    }
    if (empty($note)) {
        die('-1');
    }
    $note_id = edd_insert_payment_note($payment_id, $note);
    die(edd_get_payment_note_html($note_id));
}
do_action('edd_view_order_details_billing_after', $payment_id);
?>

							<div id="edd-payment-notes" class="postbox">
								<h3 class="hndle"><span><?php 
_e('Payment Notes', 'edd');
?>
</span></h3>
								<div class="inside">
									<div id="edd-payment-notes-inner">
										<?php 
$notes = edd_get_payment_notes($payment_id);
if (!empty($notes)) {
    $no_notes_display = ' style="display:none;"';
    foreach ($notes as $note) {
        echo edd_get_payment_note_html($note, $payment_id);
    }
} else {
    $no_notes_display = '';
}
echo '<p class="edd-no-payment-notes"' . $no_notes_display . '>' . __('No payment notes', 'edd') . '</p>';
?>
									</div>
									<textarea name="edd-payment-note" id="edd-payment-note" class="large-text"></textarea>

									<p>
										<button id="edd-add-payment-note" class="button button-secondary right" data-payment-id="<?php 
echo absint($payment_id);
?>
"><?php 
_e('Add Note', 'edd');
function edd_ajax_store_payment_note()
{
    $payment_id = absint($_POST['payment_id']);
    $note = wp_kses($_POST['note'], array());
    if (empty($payment_id)) {
        die('-1');
    }
    if (empty($note)) {
        die('-1');
    }
    $note_id = edd_insert_payment_note($payment_id, $note);
    die(edd_get_payment_note_html($note_id));
}