The PayPal Payments extension allows you to reroute standard Symphony events to PayPal Standard Payments.

1. Upload the paypal_payments folder in this archive to your Symphony extensions folder.

2. Enable it by selecting the PayPal Payments, choose Enable from the with-selected menu, then click Apply.

3. Go to "System" -> "Preferences" and enter your merchant email/ account ID under the PayPal Payments.

The extension includes an event filter that handles the redirection and a "Save IPN data" Event that logs transactions and reconciles returned data with the newly created entry.

The Reroute to PayPal filter lets you pass data to PayPal’s server by mapping fields to most of the variables/fields listed in Website Payments Standard documentation. The example below shows how you would map amount, first-name/last-name and description to their PayPal equivalents:

<form action="" method="post">
	<input name="fields[amount]" type="text" />
	<input name="fields[first-name]" type="text" />
	<input name="fields[last-name]" type="text" />
	<textarea name="fields[description]"></textarea>

	<input name="paypal-payments[cmd]" value="_xclick" type="hidden" />
	<input name="paypal-payments[notify_url]" value="{$root}/paypal/" type="hidden" />
	<input name="paypal-payments[amount]" value="amount" type="hidden" />
	<input name="paypal-payments[name]" value="first-name,last-name" type="hidden" />
	<input name="paypal-payments[item_name]" value="description" type="hidden" />

	<input type="submit" name="action[save-entry]"/>
</form>

Note that the id of the newly created entry will be automatically passed to PayPal as the invoice. Multiple fields can be mapped by separating them by commas, they will be joined with a space. All field mappings are optional. Fields that do not match a 'mapped' field will be passed on unchanged, as with cmd in the example above.

This event is used to deal with data returned by PayPal’s Instant Payment Notification (IPN). It does the following:

1. Saves the transaction details to the transaction log.
2. Reconciles the data return by PayPal with matching fields in the originating entry.

A number of default fields are logged in the transaction log. They are:

• invoice
• payment_type
• payment_date
• payment_status
• address_status
• payer_status
• first_name
• last_name
• payer_email
• payer_id
• address_name
• address_country
• address_country_code
• address_zip
• address_state
• address_city
• address_street
• residence_country
• tax
• mc_currency
• mc_fee
• mc_gross
• txn_type
• txn_id
• notify_version
• verify_sign

Any of these fields (and most of the other fields returned by the IPN — see the valid variables list below) can be saved back into the original entry by including a field in the matching section with the exact same name. Your IPN data must include an invoice field that matches an entry ID in your site otherwise the data will be discarded (this means when testing via the PayPal sandbox you'll have to manually set the invoice value).

Note: for the event to work you'll need to make sure the your IPN URL points to the page that has this event attached.

• address
• address_city
• address_country
• address_country_code
• address_name
• address_state
• address_status
• address_street
• address_zip
• adjustment_reversal
• authorization
• auth_amount
• auth_exp
• auth_id
• auth_status
• business
• buyer-complaint
• chargeback
• chargeback_reimbursement
• chargeback_settlement
• charset
• confirmed
• contact_phone
• custom
• echeck
• exchange_rate
• first_name
• guarantee
• instant
• intl
• invoice
• item_name
• item_number
• last_name
• mc_currency
• mc_fee
• mc_gross
• mc_handling
• mc_shipping
• memo
• multi-currency
• notify_version
• order
• verify_sign
• other
• parent_txn_id
• payer_business_name
• payer_email
• payer_id
• payer_status
• paymentreview
• payment_date
• payment_fee
• payment_gross
• payment_status
• payment_type
• pending_reason
• protection_eligibility
• quantity
• reason_code
• receiver_email
• receiver_id
• refund
• remaining_settle
• residence_country
• settle_amount
• settle_currency
• shipping
• shipping_method
• tax
• test_ipn
• transaction_entity
• txn_id
• txn_type
• unconfirmed
• unilateral
• unverified
• upgrade
• verified
• verify

As the information needs to be submitted to PayPal via POST and that POST data can't be manipulated we have to 'fake' a way of passing it on. This is done by redirecting the user to a dynamically generated form that is automatically submitting via JavaScript—the downside obviously being that if a user does not have JavaScript enabled then they'll have to click through to continue onto PayPal.