With the release of Market Theme 4.0, it is now actually easier to integrate e-junkie into your Market Theme site.

E-junkie is a great system for handling digital products.  It's secure digital product delivery, so your downloadable product location cannot be shared, it's only
$5 a month, and you can have a bunch of different product listings.

Here's a quick overview of how to convert Market theme 4.0 and up to work with e-junkie digital downloads…

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1.  Ok, first you'll need to create listings for your products through the Market theme "add product" admin page in your WordPress administration area.

For each of your product listing, write down the product post ID
generated for each.  (You can see the post ID if you hover over the
listing in the "Manage Posts" area of the WP administration area.  If you see something like "p=11", that means your product post ID for that one is "11". 

2.  Next, you'll need to enter and upload your digital products into your e-junkie account.  
(You'll also want to setup the rest of the e-junkie administration settings
including profile, thank you page information, your Paypal ID, etc.)

3.  For each product you enter in e-junkie, Under the "Item Number" field
of the Product Configuration page, enter the WordPress product post ID
that you wrote down in step #1.

Make sure you save all your product entries.

Now, you'll need to go back to your Market Theme admin area and modify your product listings in order to add the checkout link to e-junkie.

4.  Ok, so now open one of the digital download product posts you created in your Market Theme administration area.

5.  In the area of the "Add/Edit Product" page that says "Product Affiliate Link URL", click on the checkbox to format it as an affiliate link.  In the text box that appears,  enter your e-junkie link containing your product post ID and your e-junkie client account ID.  It will look something like this:

https://www.e-junkie.com/ecom/gb.php?i=11&c=single&cl=XXXXX

Where "11" is your product post ID and "XXXXX" is your e-junkie client ID.

6. Save the product post changes.

7.  Repeat steps #4 through 6 for each of your digital products.

Now, when you load your product details page on your website for your digital product, you will see the page formatted a little different.  Rather than an "add to cart" button at the bottom of the product details page, you now will have a graphic saying "Get Full Details".

Clicking on this image will take your visitor to the e-junkie checkout area.

Lastly..

Since you're offering digital download products through e-junkie, if you don't have a need for your Market Theme installation to display the "View Shopping Cart" link in the upper right of the screen — that can easily be turned off by changing a setting within the Market Theme settings area.  Just change your shopping cart checkout method to "All Products use Affiliate Link Format".

Note:  There's a good chance that you will want your graphic image to say something else.  If you do, it's easy to change. 

All you have to do is take the image you'd rather display (such as the standard "Buy Now" image), and rename it to: 

      aff.gif

(FYI: It will need to be saved as a ".gif" file.)

Then, just upload it to the "/imgs" folder of your Market Theme files.  Tyipcally the full path would be:

wp-content/themes/mk4/imgs/aff.gif

No, you'll still need to use the product ID.

You'll be able to see that in the Wordpress administration area, by going to the product link and hovering over it, or clicking on it and looking at the "p=" value in the URL.

Yes, that's called the browser's "status bar".

Yes, it would be confusing — which is why we currently say that you can't really do digital products and physical products at the same time.

You CAN in fact do it, but we agree that it's just like you say — it would likely be confusing to customers.

Within the next couple of months, we hope to have improved functionality to handle digital products completely without the need for an outside service like e-junkie.com. You'll also be able to have both digital products and physical products offered at the same time without issues like this.