Help with using VBO to change payment status in Ubercart orders

Sorry for the late reply. You need to find an action for the Ubercart orders. That would typically be located in an Ubercart sub-module. If you can't find it, it's best to ask the UC folks.

I know UC isn't part of Drupal core, but VBO might want to consider including this action given how popular UC is. From what I can see, UC also doesn't have a good way of bulk changing the status of orders. Here's a quick action I wrote to change the status of an order.

function luminary_network_change_order_status_action_info() {
	return array('luminary_network_change_order_status_action' => array(
		'type' => 'uc_order',
		'label' => t('Change Order Status'),
		'configurable' => TRUE,
		'triggers' => array('any'),
	));
}

function luminary_network_change_order_status_action_form($context) {
	
	$options_order_status = array();
	$options_order_status['_active'] = t('Active');
	foreach (uc_order_status_list() as $status => $name) {
		$options_order_status[$name['id']] = $name['title'];
	}
  
	$form['general'] = array(
		'#type' => 'fieldset',
		'#title' => t('Change Order Status'), 
		'#description' => t('Changed the status of the selected orders.'),
		'#collapsible' => TRUE, 
		'#collapsed' => FALSE,
		'#weight' => 1,
	);

	$form['general']['new_status'] = array(
		'#type' => 'radios',
		'#title' => t('Change Order Status'),
		'#options' => $options_order_status,
		'#weight' => 0,
		'#required' => TRUE,
		'#description' => t('Change the status of the selected orders.'),
	);
   
  return $form;
}

function luminary_network_change_order_status_action_submit($form, $form_state) {
	return array(
		'new_status' => $form_state['values']['new_status'],
	);
}

function luminary_network_change_order_status_action(&$entity, $context) {

	$new_status = $context['new_status'];
	
	$update_order = uc_order_update_status($entity->order_id, $new_status);
  
}

This is best discussed as a feature request to UC. Please rewrite your action as a patch against the latest UC dev and mark this issue as "needs review" when done.

Views integration in Ubercart 6.x-2.x is handled in the uc_views project. There is an open feature request for this at #1701918: New feature: Arbitrarily change order status with bulk operations although it is unlikely to be committed as Drupal 6 is reaching end of life.