USA and CANADA ONLY. Paypal does not support Paypal Advanced in other countries. Other countries may be able to use their Paypal Pro Hosted service which I also have an extension for here:
http://opencartguru.com/paypal-pro-hosted-integral-solution


Supported OpenCart Versions:
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1.5.x
2.x
3.0


What does it do:
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This contrib adds support for "PAYPAL ADVANCED" payment integration from PayPal.
This is a $5/month* credit card processing option from PayPal.
It allows the use of iframes to let the customer stay on your site to pay, or redirect to the paypal site to pay.
Both can be done under the protection of paypal's secure servers.
If using the iframe option, the process is seamless and customers get to enter card data directly on your site.

*($10/mo in Canada)


Requirements:
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* You will of course need to have a Paypal Advanced Account.
* If using the iframe option, you will probably want an SSL certificate to avoid the "Mixed Content" warnings that browsers show. This happens if your site is unsecured and the iframe paypal site is secured. If you do not have an SSL, then you will need to use the redirect mode.


Main features:
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* Paypal only charges $5/month for this service in US ($10 in Canada)
* Itemized Paypal Cart lets you see each item in the cart on your paypal invoice
* Seamless iFrame integration
* No core files overwritten
* PCI Compliant since no sensitive data is collected on your site
* Debug Mode (logs debug info to your system error log for troubleshooting)
* Full support of error handling and logging.
* Supports Sandbox mode
* Mijoshop Compatible!