Is there a way to access the $_POST variable from within a plugin? I don’t want to use the official forms plugin just for one simple task… I’ve tried $this->grav['uri']->post() because I saw it in the source code of the official plugin and an unknown function error. I also tried $this->grav['twig']->twig_vars['post'] = $_POST; and I get null!
I usually just use $_POST in PHP and pass to Twig as needed. Is that not sufficient for your implementation?
Unfortunately the problem was in my request implementation 
Thanks for taking the time to answer though.