Create mn_spco_change_line_item_before_payment_options_step.php

in response to eventespresso/event-espresso-core#240

checkout/mn_spco_change_line_item_before_payment_options_step.php

@@ -0,0 +1,16 @@
+//changes the first line item's unit price to 10, from whatever it was before
+//this will be displayed during SPCO's payment options step
+
+add_action('AHEE__Single_Page_Checkout__after_attendee_information__process_reg_step', 'custom_hook', 10, 1);
+function custom_hook(EE_SPCO_Reg_Step_Attendee_Information $data)
+{
+    $purchases = $data->checkout->transaction->items_purchased();
+    $first_item = reset($purchases);
+    //we need to edit the sub-item's unit price, as
+    //the line item's total is calculated from its sub-items
+    $children = $first_item->children();
+    $child_line_item = reset($children);
+    $child_line_item->set('LIN_unit_price', 10);
+    $data->checkout->cart->get_grand_total()->recalculate_total_including_taxes();
+    $data->update_checkout();
+}