Aaron D. Campbell

Shopp Improved is a plugin that extends the popular 
<a href="http://shopplugin.net/" rel="nofollow ugc">Shopp eCommerce solution for WordPress</a>. 
You must have the <a href="https://shopplugin.net/store/" rel="nofollow ugc">Shopp 
Plugin</a> in order to use this plugin.
I recently worked on a site where I used the Shopp WordPress plugin to set up 
E-Commerce. The first big issue that I ran across was allowing for user 
customizations of products. For example, if a product can be engraved with a 
name, includes the person’s initials, can include a message, etc. Shopp does 
include the ability to add these kinds of user input fields, but it’s done 
through a template tag. This means that you either have to apply it to all 
items, or you need a developer to set it up on a per-product basis. My client 
has quite a few products that are custom-made, and they really needed to be able 
to set up these fields themselves.
In comes Shopp Improved. It creates a user interface to allow you to easily add 
these fields to any product. The inputs can then be easily integrated into a 
shopp product template with just a couple lines of code.
Requires PHP 5+.

Shopp Improved

A related posts plugin that works quickly evenShopp Improved is a plugin that extends the popular Shopp eCommerce solution for WordPress.

Shoppdeveloper.com

Warning!
Visa and MasterCard rules require that merchants only authorize payments for delayed fulfillment orders 
until the order ships out. In other words, merchants are not supposed to capture the payment until the 
shipment is handed over to the shipping carrier. It is not illegal to authorize and capture payments 
before shipping. But it puts both the merchant and the customer at higher risk. 
For this reason, to protect the merchant, Shopp uses authorization-only payment processing for shipped orders.
Despite the risks, some merchants still prefer the automatic capture when new orders are placed. 
You can edit your theme’s functions.php but these changes are easily lost when you change your theme. 
This plug-in will do the dirty work for you.

Shopp Auto Capture Payment

Add-on for Shopp e-commerce plug-in to auto capture payments.

Shopp Improved vs Shopp Auto Capture Payment