autoship_frequency_cart_order_item_schedule_display_label

Can be used to customize the "Schedule" label found on a Scheduled Order's metadata and in the Cart items metadata displayed.

Example

// customize item label 'Schedule' to 'Subscribe' in cart
function xx_change_so_freq_display_label ($label){
    return 'Subscribe';
}
add_filter('autoship_frequency_cart_order_item_schedule_display_label', 'xx_change_so_freq_display_label', 10, 1);