Add extensive context information

This patch leads to
Notice: Undefined index: cid in payment_webform_payment_finish() (line 230 of ...\sites\all\modules\payment_webform\payment_webform.module).

with a paypal payment and a 403 error, so the webform cant be submitted.

After re-adding the context_data (see below) everything works fine.

function payment_webform_page_payment($node, $cid) {
  $component = $node->webform['components'][$cid];
  $payment = new Payment(array(
    'context_data' => array(
       'cid' => $cid,
    ),  
    'context' => 'payment_webform_' . $node->nid . '_' . $cid,
    'currency_code' => $component['extra']['payment_currency_code'],
    'description' => $component['extra']['payment_description'],
    'finish_callback' => 'payment_webform_payment_finish',
  ));
  foreach ($component['extra']['payment_line_items'] as $line_item) {
    $line_item->name = 'payment_webform_' . $line_item->name;
    $payment->setLineItem($line_item);
  }

  return drupal_get_form('payment_form_standalone', $payment);
}

This is in the 7.x-1.0 version.