Send mail when payment clears + Simple admin

I wanted the system to send a mail when payment is cleared and not when checkout is pressed, because I didn't know if the payment was made or not... here is my fix + a simple and basic admin

/**
 * Implementation of hook_help().
 */
function salemail_help($section = 'admin/help#salemail') {
  switch ($section) {
    case 'admin/help#salemail':
      // Here is some help.
      return t('The Salemail module allows you to send an email to the specified email address when a payment is cleared.');
  }
}


/**
 * Implementation of hook_ec_settings().
 */
function salemail_ec_settings() {

  $output = '';

  $form['settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Main settings'),
	  '#collapsible' => FALSE, 
	  '#collapsed' => FALSE,

  );
  
  // ACTIVATED
  $form['settings']['salemail_active'] = array(
    '#type' => 'radios',
    '#title' => t('Enable Salemail'),
    '#default_value' => variable_get('salemail_active', 0),
    '#options' => array(t('Disabled'), t('Enabled')),
    '#description' => t("Enable or disable transaction notifications.  If enabled, the specified person will receive an email each time a payment is completed."),
  );

  // EMAIL ADDRESS
  $form['settings']['salemail_email'] = array(
    '#type' => 'textfield',
    '#title' => t('Email'),
    '#default_value' => variable_get('salemail_email', variable_get("site_mail", ini_get("sendmail_from"))),
    '#size' => 20,
    '#maxlength' => 255,
    '#description' => t('An invoice email will be sent to this email address upon payment completion.'),
  );

  return system_settings_form($form);
}

/**
 * Implementation of hook_menu() - for salemail callback
 */
function salemail_menu($may_cache) {

  $items = array();
  if ($may_cache) {
    $items[] = array(
      'path' => 'admin/ecsettings/salemail',
      'title' => 'Salemail',
      'description' => t('Allow specified email address to be noticed when a payment in complete.'),
      'callback' => 'drupal_get_form',
      'callback arguments' => array('salemail_ec_settings'),
      'access' => user_access('administer store'),
      'type' => MENU_NORMAL_ITEM,
    );
  }

  return $items;
}

/**
 * Implementation of hook_ecommerceapi() - for salemail callback
 */
function salemail_ecommerceapi(&$txn, $op) {

  //If the review screen has been submitted then send an email]
  //Note that ec4 supports post_process as an operation.
  if ($op == 'on payment completion') { 
	
	$active = variable_get("salemail_active", 0);
	if ($active) {
   	 	//Send an email   
    	$to = variable_get("salemail_email", variable_get("site_mail", ini_get("sendmail_from")));
    	ec_mail_send_mid(variable_get(MAILVAR_SALEMAIL, 0), $to, &$txn);
    }
    
  }
  
}

Perhaps you might be interested in some part of it.

Thanks for the core !