Magento Certified Developer Guide

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Which classes and methods are responsible for credit card operations
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What is the difference between order status and order state
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What happens when existing orders are edited in the admin
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Which setup methods are available to work with EAV entities?
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Describe the role of Zend_Db_Select in Magento
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Describe the collection interface (filtering/sorting/grouping)
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What happens if the requested file is missed in your theme/package?
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How does the standard router map a request to a controller class
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How does Magento process requests that cannot be mapped
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Describe typical Magento module structure
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Describe class group configuration and use in factory methods
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Set up a cron job
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Register an Observer
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What configuration parameters are available for cron jobs
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Describe how to plan for internationalization of a Magento site
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In what way does the developer mode influence how Magento handles translations
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What is the priority of translation options
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How are translation conflicts (when two modules translate the same string) processed by Magento
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How is the final WSDL composed? How can it be customized
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What are the syntactical differences between API versions
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What classes are typically involved in Magento widget architecture
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How are admin-configurable parameters and their options specified
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Can a customer be added to two customer groups at the same time
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How can attributes be added to a customer address? How are custom address attributes you added converted to an order address
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How does customer information affect prices and taxes
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How does the number of shipping and billing address entities affect the frontend interface for customers
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What is the difference between shipping and billing addresses for a customer
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How can customer-related email templates be manipulated
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How is customer information validated
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What is the customer resource model
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What is the structure of tables in which customer information is stored
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How is data for partial operations stored
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How do partial order operations affect order state
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What is the role of the credit memo total models in Magento
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What is the difference between online and offline refunding
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How does Magento process shipping fees when refunding an order
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How does Magento process taxes when refunding an order
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Which classes are involved, and which tables are used to store refund information?
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How does Magento store shipping and tracking information
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How can different items from a single order be shipped to multiple addresses. Is it possible at all
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How does Magento store information about invoices
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What are the roles of the total models in the context of the invoice object
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What are the roles of the order, order_payment, invoice, and payment methods in the process of charging a card
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What is the difference between “pay” and “capture” operations
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How does Magento calculate price when an order is created from the admin
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Which classes are involved in order creation in the admin? What are their roles (especially the role of adminhtml classes)?
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Which model is responsible for multishipping checkout in Magento
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How many times are total models executed on a multishipping checkout in Magento
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How can different product types be split among multiple addresses when using multishipping in Magento
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What is the difference in the multishipping processing for a quote with virtual products in it
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How does the storage of quotes for multishipping and onepage checkouts differ
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How do payment modules support billing agreements
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What is the typical structure of the payment method module
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What is the difference between payment method and payment classes (such as order_payment, quote_payment, etc.)
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How can the stored data of payment methods be customized (credit card numbers, for example)?
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Which class is the basic class in the payment method hierarchy
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How can payment method behavior be customized (for example: whether to charge or authorize a credit card; controlling URL redirects; etc.)
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How do US shipping methods (FedEX, UPS, USPS) work
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How does the TableRate shipping method work
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What is the hierarchy of shipping information in Magento
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How does Magento calculate shipping rates
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Describe the programmatic structure of shipping methods, how to customize existing methods, and how to implement new methods
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What is the difference between shopping cart and catalog price rules
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Which module is responsible for shopping cart price rules
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At which moment(s) are total models executed
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Which class runs total models processing
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To which objects do total models have access in Magento, and which objects do they usually manipulate
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How can the priority of total model execution be customized
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How you can customize total models
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What are total models responsible for in Magento
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When exactly does card authorization and capturing occur
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When exactly does inventory decrementing occur
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How do products in the shopping cart affect the checkout process
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How does Magento process additional information about products being added to the shopping cart
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What is the difference in processing quote items for onepage and multishipping checkout in Magento
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What is the difference between shipping and billing address objects in Magento? How is each used in the quote object?
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How are different product types processed when added to the cart
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How does Magento store information about the shopping cart
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What is the shopping cart model used for in Magento
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What is the quote model used for in Magento
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How is ACL information stored in the database
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What is the relationship between Magento and Zend_Acl
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Where is the code located that processes the ACL XML and where is the code that applies it
OpenManish Prakash asked 4 years ago • 
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What is adminhtml.xml used for? Which class parses it, and which class applies it
OpenManish Prakash asked 4 years ago • 
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What is the XML syntax for adding new menu element
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For what purpose is the _isAllowed() method used and which class types implement it
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How do different scopes (global, website, store) work in Magento system configuration
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What is the difference between Mage::getStoreConfig(…) and Mage::getConfig()->getNode(…)
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How does Magento store data for system configuration
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What is the syntax to specify a custom renderer for a field in system configuration
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Which classes are used to parse and render system configuration XML
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What is the syntax for specifying the options in dropdowns and multiselects
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How can the CSS class of system configuration elements be changed
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How does the structure of system.xml relate to the rendered elements in the System Configuration view
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How can elements in system configuration be rendered with a custom template
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What is the programmatic structure of mass actions
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What is the role of the grid container class and its template
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How can JavaScript that is used for a Magento grid be customized
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What are column renderers used for in Magento
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What is the standard column class in a grid, and what is its role
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