Showing one page's content on another page

You could use https://codex.wordpress.org/Class_Reference/WP_Query#Post_.26_Page_Parameters

This would probably result in something like this in your page template:

<?
$the_query = new WP_Query( 'page_id=7' )
while ( $the_query->have_posts() ) :
	$the_query->the_post();
        the_title();
        the_content();
endwhile;
wp_reset_postdata();
?>

This would show you title and contents of page with the ID 7.

you can wrap this into a shortcode as well. Paste this in your functions.php file and you can now use the shortcode
” [my_content id=”Enter your page id number” title=Set this to true if you want to show title /] “

function get_post_page_content( $atts ) {
			extract( shortcode_atts( array(
				'id' => null,
				'title' => false,
			), $atts ) );

			$the_query = new WP_Query( 'page_id='.$id );
			while ( $the_query->have_posts() ) {
				$the_query->the_post();
			        if($title == true){
			        the_title();
			        }
			        the_content();
			}
			wp_reset_postdata();

		}
		add_shortcode( 'my_content', 'get_post_page_content' );

@redpointcs this code will only work from within WordPress.
If you want to call contents from WP to your ecommerce software, you will indeed need to write a piece of code which would connect to the WP database and get the infos you need.
Good luck 🙂

The easiest (and probably also ugliest) way would be to integrate an iframe of your WordPress page into a page of your CMS.

i know this reply is a few weeks old

Replace first line with below

<? $the_query = new WP_Query( ‘page_id=149’ );