Mariano explains how to Embed PowerApps apps in Dynamics GP
dynamicsgpblogster.blogspot.com/2019/08/microsoft-dynamics-gp-embed-powerapps.html
The Dynamics GP Blogster: Microsoft Dynamics GP | Embed PowerApps apps
Archived post from 2019. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.