How to change display order of PBA Service Plans in the Online Store?
Use the 'Show Priority' parameter defined on the 'General' tab in Service Plan properties:
Use "Listing Priority" parameter on the "Publication Settings" tab of the service plan:
The parameter defines the order in which the Service Plan is shown in the Online Store among other plans of the same sales category. At first the service plans without priority are shown, then service plan with the smallest priority (e.g. 1) and so on in the ascending order.
Change the priority to the requested one and synchronize the Online Store to apply changes.