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1. Stock Adjusments in checkout process php and/or paypal payment module, so it substract from product allready when order has order status "Preparing [PayPal Standard]". And combine it to a existing addon (http://addons.oscommerce.com/info/8707) that would put products back in stock when order is put to orderstatus: canceled.
2. Add a admin toolbar on top of frontend websshop (when logged in as admin)
This fuctions/links are important:
- Edit product (goes to admin backend to edit current product)
- Edit categories (goes to admin to current category/subcategory for editing)
- Edit quicktext to categories (goes to admin backend to Subcategory textbox editor )
- Link to admin
- Add product (to current category)
Example picture added