PHP 5 e-commerce Development- P51 pot

Up to this stage, our customers can place orders, go right through the order process, including selecting a payment method, but they cannot yet make payment for their order.. In this cha

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Order item attributes

Because some products can have selectable attributes, we need to also select these

and store them in the database

Field Type Description

Order_item_id Integer The product item record for an order

Attribute_id Integer The attribute of this product which is being ordered

Payment methods

Finally, we have payment methods This database table stores a list of payment

methods We will come on to this properly in the next chapter; however, for now

we do need a table, because we reference payment methods in the order table

Field Type Description

ID Integer, Primary key, Auto

Type Enum(offline, online) Indicates if the payment method is for

online or offline payment

Summary

In this chapter we have taken our framework and extended the order process, so that

the customer is now ready to make their payment

We now check that the customer is logged into the store, and if they are not we allow

them to log in or create an account The customer can then set a delivery address,

and their default delivery address is shown So, if they choose to use that, they don't

need to change anything The customer can then select the payment method they

wish to use to pay for the order Finally, the customer can review their order, before

confirming and placing the order At any time during this process, the customer can

move backwards and forwards between stages if they wish

The next stage is to actually take payments from our customers!

Taking Payment for Orders

Now that our checkout process has been implemented, we are left with the final

stage: payment Up to this stage, our customers can place orders, go right through

the order process, including selecting a payment method, but they cannot yet make

payment for their order In this chapter, you will learn:

How to take payment online

Using PayPal Using other methods How to take payment offline for our store

How an order progresses once payment has been made

Taking payment

Taking payment is a fundamental aspect for any business; without payment, the

business would not be able to function With e-commerce stores, one of the benefits

is that we can take and process payment instantly online, giving the customer

reassurances that their order has been placed and will be processed, and also

giving assurance to the store that payment has been made

Our payment system

For our payment system to work, we will need to separate logic for each payment

method out into a different set of files For instance, if the customer opts to pay

online using PayPal, we need to generate a PayPal payment button If they opt to pay

online, we need to display payment details to them If we want to add new payment

methods in the future, we need to be able to easily slot in a new payment method

Different payment gateways have different ways of receiving payments and of

sending notification back to us that a payment has been made This logic needs

to be encapsulated in the separate gateway files

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The best way to do this would be to create a single payment processor object, and

have each payment method extend and inherit from this object However, this

would require more research and investigation into other payment methods to get

the optimal method Instead, we will use the factory pattern; this will create a new

payment gateway object depending on the payment method the customer chooses

The Factory pattern implementation is highlighted in the following code:

// get the order details

$orderId = intval( $urlBits[2] );

// we should really abstract this out into an order object

$sql = "SELECT o.*, p.`key` AS payment

FROM orders o, payment_methods p

WHERE p.ID=o.payment_method AND o.ID={$orderId}";

$this->registry->getObject('db')->executeQuery( $sql );

if( $this->registry->getObject('db')->numRows() > 0 )

{

$data = $this->registry->getObject('db')->getRows();

$method = $data['payment'];

require_once FRAMEWORK_PATH 'controllers/payment/methods/'

$method '.php';

$this->paymentMethod = new Paymentmethod();

switch( $urlBits[1] )

{

case 'process-payment':

$this->paymentCallback();

break;

case 'make-payment':

$this->displayMakePayment();

break;

}

}

To display a payment page, we need to take our payment method object, and either

display a form for credit card details, a PayPal payment button, or details for sending

a payment through check in the post

The following code takes out the payment method object, assigns appropriate template

tags, and builds the template from a template specific to the payment method:

private function displayMakePayment()

{

$paymentKey = $this->paymentMethod->getKey();

// template tags please

$this->paymentMethod->makePaymentScreen();

$this->registry->getObject('template')->

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buildFromTemplates('header.tpl.php',

'payment/'.$paymentKey.'.tpl.php','footer.tpl.php');

$tags = $this->paymentMethod->getTags();

$this->registry->getObject('template')->dataToTags( $tags, '');

}

When it comes to processing the payment, we simply call a payment processing

method for our paymentMethod object

$this->paymentMethod->processPayment();

Taking payment online

There are a number of different ways in which we can take payment online, using a

number of different gateways, which we will discuss later in this chapter However,

for our Juniper Theatricals store, the owner wants to take payment through PayPal,

because it is quick and easy to sign up to, you don't need a PayPal account to send

payment, and it is well known So let's look at integrating PayPal functionality into

the store

PayPal

PayPal is one of the most well-known payment gateways available, primarily

through use with its parent company eBay One of the main benefits of PayPal is

the low cost barrier of entry to use it, and its simple standard payment system for

website integration

The payment button

PayPal's standard payment options rely on a payment button We generate a form

and a button on our site, which store details such as the order number, seller's PayPal

details, and other information as hidden fields When the customer clicks on the

button, the data is posted to PayPal

Our PayPal payment method object sets many of the variables required for this

button to work

private function makePaymentScreen()

{

$this->registry->getObject('template')->getPage()->

addTag('payment.email', $this->registry->

getSetting('payment.paypal.email') );

$this->registry->getObject('template')->getPage()->

addTag('payment.currency', $this->registry->

getSetting('payment.currency') );