1ShoppingCart payment plugin configuration
        
1. Enable "1shoppingcart" payment plugin at aMember CP->Setup->Plugins
2. Configure "1shoppingcart" payment plugin at aMember CP->Setup->1ShoppingCart
   Make sure you set the same postback password in aMember CP and 1ShoppingCart
   Merchants CP.
3. Create equivalents for all aMember products in 1ShoppingCart Merchants CP.
   Make sure it has the same subscription terms (period, price) as aMember
   Products. Set "Thanks URL" for all 1ShoppingCart products to 
    {$config.root_url}/thanks.php
   Write down product# of all 1ShoppingCart products. 
4. Visit aMember CP -> Manage Products, click "Edit" on each product
   and enter "1ShoppingCart Product#" for each product, then click "Save".
5. Try your integration - go to aMember signup page, and try to make new signup.
   {$config.root_url}/signup.php