Sorry, doesnt' work

The listings appear nicely, but break my theme. No options for the number of columns, only listings. This isn’t sensible, as people who use such plugins have their own styled pages and expect it to work within the page design.

Further, it cannot be called by a shortcode, which makes it very difficult to place where the website designer wants it to appear. Your plugin seems to set itself into the header of the page, as if it knows where the designer wishes it to go. Furthermore, it posts the seller ID in big, bold letters, without consideration to how a site should look.

Do yourself a favor, seriously… consider the other guy when making your plugins. Inevitably your user counts more than anything.