How to embed an external php script into a WordPress site template?

Question

Programming

Hello!
There is an external search script for an external product database. The script itself consists of folders, a page with a search form, a page with search results and a page with a detailed description of the product. Is it possible to somehow embed this script into the site template, so that, for example, on a separate page of the site there is a search form from the script, so that search results are displayed during the search, and so on. I couldn't find any information anywhere on how to do this. I ask you for help.