//This action hook allows you to access data for a new user immediately after they are added to the database. The user id is passed to hook as an argument.
    do_action( \'user_register\', $user_id );

add_action(\'user_register\',\'my_user_register_function\');

function my_user_register_function($user_id)
{
$user = get_user_by( \'ID\', $user_id );
//your CURL stuff
}

您可能希望等待BuddyPress激活用户。

尝试使用此挂钩：

do_action( \'bp_core_activated_user\', $user_id, $key, $user );