How to automatically send a transactional email on customer group change?

Question

I would like to send a custom transactional email automatically to a user when he is assigned to a specific user group.

I think doing that with on observer but do not manage to find which event to trigger…

Thank you for your help,

Answer 1

Hi you can do this by magento event Observer and find a trigger an observer on customer save after and fire send your custom transactional email automatically.

You can try this Two Event

1. customer_save_before

2. customer_save_after

Find details on event and observer here

Model Approach

Step1: trigger an event on basic of customer_save_after

<global>
    <events>
        <customer_save_after>
            <observers>
                <stockalert>
                    <type>singleton</type>
                    <class>magento37890/observer</class>
                    <method>checkDisplay</method>
                </stockalert>
            </observers>
        </customer_save_after>
    </events>
</global>       

Step2: Magento Observer Code is

<?php
class Stackexchange_Magento37890_Model_Observer
{
    public function checkDisplay(Varien_Event_Observer $observer){

        $customer=$observer->getEvent()->getCustomer();
        Mage::log('My log entry'.$customer->getId(), null, 'Magento37890.log');
        /* if customer  is old customer */
        if($customer->getId()){
            if($customer->getOrigData('group_id')!=$customer->getData('group_id')){
            /* here you write your code to send whenever you have change the group */
            }
        }else{
        /* New Customer */

        }
    }

}