This function is now deprecated and no longer in the code consider using: do_action(‘wpsc_’ . $this->current_tab_id . ‘_settings_page’)

The wpsc_shipping_settings_page action is triggered at the bottom of the Settings > Store > Shipping tab within the WordPress Administration.

This hook provides no parameters. You use this hook by having your function echo output to the browser, or by having it perform background tasks. Your functions shouldn’t return, and shouldn’t take any parameters.

This hook is an action which means that it primarily acts as an event trigger, instead of a content filter. This is a semantic difference, but it will help you to remember what this hook does if you use it like this:

add_action('wpsc_shipping_settings_page', 'your_function');

function your_function() {
  $content = '<p>This is inserted at the bottom of the Shipping tab within Settings > Store of the WordPress Administration.</p>';
  echo $content;