Help to set ID category wordpress

Hello everyone,
I have this code

if(!$hasError)
            {
                $post_information = array(
                    'post_title' => esc_attr(strip_tags($_POST['postTitle'])),
                    'post_content' => esc_attr(strip_tags($_POST['postContent'])),
                    'post_category'=>wp_get_post_categories( get_the_ID(), array('fields' => 'ids') ),
                    'post_type' => 'post',
                    'post_status' => 'pending',
                    'post_parent'=>get_the_ID(),
                );

I would like to ‘post_category a category with id 72, state that I am a beginner, I tried to put this figure in the parentheses of get_the_ID, changing forms etc .. but not working properly. I tried to guradare the wordpress documentation, but I could not figure out how to set my class properly.
I would be grateful if someone would help me.
Thank you.