If you don't understand what this mod is for, then the default shop mod is probably good enough for your site's needs. This mod will allow further customization for those who know how to program and have ideas for custom pages. This is basically just allowing a custom page to access shop information and sell pets on behalf of a hidden shop. See my signature for information on
custom pages.
I'm happy for this mod because it'll allow me to uniquely decorate each shop individually, rather than using the default adopt shop page. By default, this mod's visual appearance is 100% identical to the freely available adoption page, the only difference is that pets are not free. If you know how add your own html (again, see the
custom page guide), you can easily modify the appearance of the page, add in a shop keeper, etc.