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<?php
add_filter('gform_user_registered', 'send_alpha_notification', 10, 4);
function send_alpha_notification($user_id, $config, $lead, $password) {
   add_filter('login_url', 'modify_alpha_login_url');
   wp_new_user_notification($user_id, $password);
   remove_filter('login_url', 'modify_alpha_login_url');
}

function modify_alpha_login_url($login_url) {
   // change login url to alpha welcome page
   return get_permalink(788);
}