Embedded apps

[wizart]

Hi there! We have a service (Product information management system used to import data to our visualizer app) to be integrated into Shopify, but this very service uses another domain name, not the same as our app domain name. We’ve implemented Redirect.toRemote, but it didn’t work, the same as Redirect.toApp (because the service which we need to embed uses another domain name). From what we understood, it is not possible to embed the service as I-frame. Any ideas/suggestions on how we could imbed this service with the domain name different from our general app domain name, into Shopify?  We are not using React, Vanilla JavaScript.

Thank you in advance!