I want to have in my website only the membership option available for the users but i want when they click the "index.php?page=item&action=item_add" (item post page) to REDIRECT the user to the "index.php?page=custom&route=osp-membership" page of the plugin

only when the user choose membership group and pay (ex. paypal, bank transfer...) to be able to publish listings!!

This is the reason that i bought the plugin!

@developGr
In item-post.php, somewhere at start add:

<?php
  $user_group = ModelOSP::newInstance()->getUserGroup(osc_logged_user_id());

  if($user_group <= 0) {
    osc_add_flash_error_message(__('Only members of bellow listed groups can add new listing.', 'osclass_pay'));
    header('Location:' . osc_route_url('osp-membership'));
    exit;
  }
?>


thanks!