Payment Gateway Setup (Paypal)

Overview
Please follow the instructions below to activate this gateway. If the payment gateway's interface has changed or if the screenshots (where applicable) look different, please let me know.
Paypal IPN - Setup
1: Sign up for a Paypal premier or business account.
2: Log into your Paypal account.
3: From the "My Account" tab select "Profile" > "My Selling Preferences".
4: Find "Instant payment notifications" and click "update".
5: If the IPN is already turned on, you are good to go. If a url already exists, DO NOT change this!
6: If not enabled and no url exists, click to enable the IPN system by entering the full http path to the 'checkout/paypal.php' callback file in your cart installation:

Example:
http://www.example.com/checkout/paypal.php (Or https if over SSL)

7: Save settings.
8: Enter applicable details in your Maian Cart admin area:

Sales > Payment Methods > Paypal IPN
Paypal - Callback Url
The callback url for all operations is:

https://www.example.com/checkout/paypal.php (SSL)

Where 'example.com' is your own domain. SSL MUST be installed for Paypal.
Paypal - Auto Return
If you aren`t selling product downloads and you want visitors to return to your site quicker, you can enable the auto return option.

1: From the "My Selling Preferences" screen find "Website preferences" and click "Update".
2: Turn on "Auto Return" and enter a url to send the buyer to. This should comply with Paypal`s terms and conditions. Your url should use SSL.

Sale/order info is emailed to the buyer as normal.
Paypal - Sandbox
Paypal has a full test mode via its Sandbox system. Sign up at https://developer.paypal.com/classic-home/.

Test mode should be enabled before going live. This is enabled/disabled in your admin area.

System > Global Store Settings