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I created a custom checkout pane with Drupal Commerce so if a user checkouts as anonymous they can create an account on the checkout completion page. The problem is that when in my form's submit function the form_state values are not passed and I get an undefined index error. Here is the code for the checkout form:

function commerce_checkout_complete_registration_pane_checkout_form($form, &$form_state, $checkout_pane, $order) {

      $form['new_email'] = array(
        '#type' => 'textfield',
        '#title' => t('Email'),
        '#element_validate' => array('_validate_the_email'),
      );

      $form['pass'] = array(
        '#type' => 'password_confirm',
      );

      $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Register'),
        '#submit' => array('commerce_checkout_complete_registration_pane_checkout_form_submit'),
      );

      global $user;
      if($user->uid == 0){
        return $form;
      }

    }

And here is the submit function:

function commerce_checkout_complete_registration_pane_checkout_form_submit($form, &$form_state, $checkout_pane, $order) {
  dpm($form_state);
  $email_address = $form_state['values']['new_email'];
  syslog(1, $email_address . 'TEST');
}
1

The function "commerce_checkout_complete_registration_pane_checkout_form" needed to have the $form variable passed as a reference, &$form.

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