Create your widget as a global widget. Global widgets are automatically loaded for all pages; you do not need to add them explicitly to page layouts. Global widgets cannot include any user interface elements, so you should omit any display templates. The following shows an example of the files and directories in a global widget:

External Pricing/
    ext.json
    widget/
        external-pricing/
            widget.json
            js/
                external-pricing.js

To make the widget global, set the global property in the widget.json file to true:

"global": true

For more information about the widget structure and the contents of the ext.json and widget.json files, see the Developing Widgets guide.