Where to start with Magento Shopping Cart Abandonment?

Question

I am attempting some type of shopping cart abandonment system with Magento using it's built-in cron module. What I basically need is a system that checks for abandoned shopping carts every 15 mins and sends select cart data to another web service if certain criteria is met with each cart.

Basically here is my process (but feel free to suggest a better way):

the process

1. Get list of abandoned carts
2. For each abandoned cart...
   • Add 15 (mins) to that cart's abandoned_duration field in database
   • Check if the abandoned_duration is at 45 or 1440 (1 day) or 4320 (3 days)
     • If yes,
       • send cart information to another web service
       • If abandoned_duration is at 4320 (3 days),
         • Delete abandoned cart
     • Else,
       • continue
3. Repeat every 15 mins using Magento cron

the questions

1. Is this possible in Magento?
2. Is there a better process to do this using Magento?
3. What are the steps needed to go about implementing this? For example...
   • Which core modules are necessary?
   • Which controllers need to be extended?
   • Should I create my own module for this?
   • What is the best way to get abandoned shopping carts as an array?

The reason I am reaching out to the community is because the Magento documentation and tutorials are very vague. I am new to the Magento MVC however I am not new to PHP, OOP, and MVCs.

Any guidance here would be stellar. Cheers.

Answer 1

All this can be done using Magento, but as you said, this is a very broad question. I'll give answers to the specific topics, but I suggest you take time to study the fundamentals of Magento module development. Here is an excellent tutorial by Alan Storm (read the whole series).

Get list of abandoned carts

In Magento, the cart is simply a wrapper for the sales/quote object, so that is the entity you will be working with.
Instead of adding increments to a abandoned_duration attribute, I suggest simply checking against the updated_at field.

$adapter = Mage::getSingleton('core/resource')->getConnection('sales_read');
$minutes = 15;
$from = $adapter->getDateSubSql(
    $adapter->quote(now()), 
    $minutes, 
    Varien_Db_Adapter_Interface::INTERVAL_MINUTE
);
$quotes = Mage::getResourceModel('sales/quote_collection')
    ->addFieldToFilter('converted_at', $adapter->getSuggestedZeroDate())
    ->addFieldToFilter('updated_at', array('to' => $from));

This will give you a collection (think of it as an array with methods) of all quotes that haven't been updated for 15 minutes. You can iterate over them like an array

foreach ($quotes as $quote) {
    /* @var $quote Mage_Sales_Model_Quote */
}

Magento Cronjobs

In Magento, all cron jobs are listed in the configuration structure. So first you need to add it to the config.xml of your module (refer to the linked tutorial for more information on Magento configuration).
This XML registers a cronjob with Magento.

<crontab>
    <jobs>
        <process_abandoned_carts>
            <schedule>
                <cron_expr>*/15 * * * *</cron_expr>
            </schedule>
            <run>
                <model>your_module/observer::processAbandonedCarts</model>
            </run>
        </process_abandoned_carts>
    </jobs>
</crontab>

Now, whenever Magento runs the cronjob, it will instantiate the class your_module/observer and call the processAbandonedCarts() method.
In order for Magento to process configured cronjobs, you need to set the system up to do so. This consists of two parts: the system configuration and the triggering of the cron jobs.

The system configuration is done in the administrative interface under System > Configuration > System > Cron (Scheduled Tasks)

The triggering consists of setting up a way to periodically execute the cron.php (or cron.sh) script in the Magento root directory. This can be done using a regular crontab entry (man 5 crontab on any decent unix system for more information). Another option preferred by many is to execute the cron.php script through a curl or wget call so the processing user ID matches the regular Magento user ID (i.e. the Apache user). This might be important if APC caching is configured, but this is getting off topic.
However, on topic is that you need to call it often enough so it matches the settings you specify in the administrative interface!
I generally recommend executing the cron.php script every 5 minutes. If there is nothing scheduled it will simply exit.

One really useful extension for Magento when working with cronjobs is Aoe_Scheduler. It adds much of the user interfaces for cronjobs and interactive functionality that should be part of the core system.

Other

Sending the data to a web service is not Magento specific, but rather regular PHP, so I'll wont go into more detail.

To delete a cart, simple call $quote->delete() on the loaded sales/quote instance.

Please ask mor specific questions for further information.