Integrations with php, PHP INTEGRATION , PAYMENT INTEGRATION.

Payment Gateway integration
1. Google Checkout Integration
2. paypal standard integration (https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_html_landing)
3. paypal pro integration php (https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_api_paymentspro)
4. Payflow Link () (https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_gateway_payflow_link)
5. Payflow Pro (https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/howto_gateway_payflowpro)