PayPal is committed to providing you with the most advanced technical support expertise to ensure availability and reliability of your e-commerce applications. For details, refer to your Service Level Agreement.
For integration and connectivity issues, PayPal provides online documentation, direct email support, and phone support.
Online Information: http://knowledge.paypal.com/
This site contains a "frequently asked questions" section.
Documentation: The Documentation link (available on the top right side of all PayPal Manager pages) provides access to printable copies of PayPal Manager documentation.
Email: business-support@paypal.co.uk
Phone: 0870 730 1880
For technical support on shopping carts, contact the merchant.