To configure and customize your service plugin, you need to provide important details in the plugin.json configuration file.
If you created your service plugin extension with the CLI, required fields are automatically populated for you.
Base part of your integration's deployment URI for the Custom Charges SPI.
For example "https://provider.example.com", if Wix should call your
integration at https://provider.example.com/v1/charge-limit for the
Get Charge Limit method.
Wix calls this method to retrieve the initial charge limit for a paid instance of your app. This happens every time a customer is upgrading to a paid version of your app.
You can't update the charge limit after you've set an initial value. Customers can increase the limit in their site's dashboard, currently they aren't allowed to decrease it.