admin_enqueue_scripts not rending JS file correctly

You action filter is wrong.

First change this function name function register_scripts , it’s a bad name, use something unique.

Second change add_action ("admin_print_styles-post.php", "payee_init");

to a proper hook like add_action ("wp_enqueue_scripts", "payee_init");

http://codex.wordpress.org/Function_Reference/wp_enqueue_script