Hi all,

I've used ecommerce-0.8.1rc1 and payment module
in ecommerce/_config.php

*******************
// Extend the Member with e-commerce related fields.
DataObject::add_extension('Member', 'EcommerceRole');
// Extend Payment with e-commerce relationship.
DataObject::add_extension('Payment', 'EcommercePayment');
//create controller for shopping cart
Director::addRules(50, array(
ShoppingCart::$URLSegment . '/$Action/$ID/$OtherID' => 'ShoppingCart'
));

// copy the lines below to your mysite/_config.php file and set as required.
// __________________________________START ECOMMERCE MODULE CONFIG __________________________________
//The configuration below is not required, but allows you to customise your ecommerce application - check for the defalt value first.
// * * * DEFINITELY MUST SET
//Order::set_email("your name <sales@myshop.com>);
//Order::set_subject("thank you for your order at www.myshop.com");
//Order::set_modifiers(array("MyModifierOne", "MyModifierTwo");

// * * * HIGHLY RECOMMENDED SETTINGS NON-ECOMMERCE
Geoip::$default_country_code = "NZ";
i18n::set_locale('en_NZ');
setlocale (LC_TIME, 'en_NZ@dollar', 'en_NZ.UTF-8', 'en_NZ', 'nz', 'nz');

Payment::set_supported_methods(array(
'ChequePayment' => 'Cheque Or Pay On Site',
'PayPalPayment' => 'PayPal (Credit Card)'
));

PayPalPayment::set_test_mode('selleraccountEmail');
********************************

When I submit checkout form, it redirect to paypal sandbox and display "Some required information is missing or incomplete. Please correct your entries and try again."

Anybody can help me ?
Thank you