We do have to update the booking in EduAdmin if this should work as well..

Author: Chris Gårdenberg

class-edu-klarnacheckout.php

@@ -268,6 +268,15 @@ public function process_paymentstatus() {
 					$order->fetch();
 
 					if ( 'checkout_complete' === $order['status'] ) {
+
+						$patch_booking       = new stdClass();
+						$patch_booking->Paid = true;
+
+						EDUAPI()->REST->Booking->PatchBooking(
+							intval( $_GET['booking_id'] ),
+							$patch_booking
+						);
+
 						$update           = array();
 						$update['status'] = 'created';
 						$order->update( $update );