For Wix users, you do not have to put our code on your site in order to set up our product page widget, star rating widget (showing under product names on product pages) and onsite widget. This is automatically done for you upon successful installation.
These widgets should be showing already if you selected to show them during the onboarding. You can decide to turn them off from our dashboard.
Here are some guides to help you turn the already installed widgets on/off as well as customize them:
For other widgets such as slider widget, full page widget and badge widget, Wix does not currently support this and so you cannot set them up. However, if you really really need to set them up, kindly reach out to our support.