Advanced shipping functionality, including: Multiple flat rate; Flat rate + live rates; Allow/Disallow specific countries, states/provinces/postal codes; specific shipping methods per products (for oversized, freight, etc.); package dimensions;

Gift certificates/vouchers/cards. Allows customer to purchase and either use or give unique codes to shop.

Coupon code to allow for free shipping.

Currently, if a customer wants to delete something or change the quantity of an item in their cart on the checkout page, they cannot do so. They have to go back to the main website and view their shopping cart. This is a bit of a hassle. It would be nice if they could edit their cart in the checkout screen.

White-labeled admin interface for your clients. (This is _not_ a self-hosted solution, but rather a white-labeled admin.)

Ability to have multiple languages (with multiple different cart/checkout/receipt templates to correspond with the selected language) per FoxyCart store.

Or: The ability to have multiple templates (template for event registrations, donations, products; all in the same language) per store.

Ability to set a tax-inclusive rate, so a product with price=50 and an inclusive tax of 10% would actually display a tax line item of $5 on the cart/receipt. When voting, please provide feedback (including the country you need it for) on this request if you do vote for it.

There's a workaround here: http://bit.ly/ce00cA

For the forum discussion relating to this item, please comment here:
http://forum.foxycart.com/comments.php?DiscussionID=1090

Though styling both the ^^cart^^ and ^^checkout^^ is possible with CSS and javascript, it would be super cool to have the ability to
replace both with the editable templates that include all the necessary variables to provide more flexibility within each template.

Example: Get Product B for $5 off with purchase of Product A.

For example, I want to list prices in Canadian and US dollars and have the appropriate currency passed to FoxyCart.

Coupon per product.

How about letting us set the sub_startdate/sub_endate using a relative number?

Examples:
two weeks from now
+2w

three days from now
+3d

half a month from now
+.5m

Pay by (e)check added for gateways that support it.

Allow taxes to be calculated by using a custom tax processing script (hosted by the store, not by FoxyCart). This would allow stores to do lookups for states like Washington, which has tens of thousands of records necessary to accurately determine taxes.

Link to Washington's site:
http://dor.wa.gov/Content/FindTaxesAndRates/RetailSalesTax/DestinationBased/ClientInterface.aspx

An API to create, remove, retrieve, and manipulate coupon codes.

Foxycart plus integration with Fulfillment by Amazon would be the KILLER ecommerce app.

The ability to save a cart, or save a cart ID for reference and attachment to a user in an external system (like a CMS).

This would allow not only for saved carts, but also for things like wish lists, recommended carts (if saved carts could be replicated), and "repeat my past order" types of situations.

An API to
-- create FoxyCart stores,
-- manipulate store settings (create coupon codes, re-cache a template), and
-- retrieve store data (like transactions, subscriptions, errors, etc.).

This would allow FoxyCart to be completely integrated into external systems.

There needs to be some way for a customer to specify that they are tax exempt. As it stands I have to actually turn OFF tax for their jurisdiction, and then turn it back on after they have ordered.

The ability to use the FoxyCart checkout completely programatically would allow an insane degree of flexibility. Create a completely custom checkout form or order process, for example, or use FoxyCart inside of non-website settings (like Adobe AIR, Flash, etc.).