Add Wordpress-'Post' to PHP pages

We need to integrate specific 'posts', coming from wordpress-database into our booking process. If you go to [login to view URL], search for a flight and go through all the booking process until payment site, you will see on in the right frame boxes with the flight details. Above these boxes, we would need to add a box which displays a site-specific message. For example: On the search results site will be a different message then on the site where you put your passenger names. The posts should come from the wordpress database where we handle all wp-posts multilingual. So all posts depend on the site they are displayed (4 in total) and the languages given by wordpress. Please post questions here. No PM. Please note: - We pay after the job is done and three days successfully tested against invoice by paypal. - No development in live-environment - We are interested in long-term partnership