How can I embeed an external App to my store?

Hi!

I’m trying to embed an app in my shopify store. And the requirements that my app developer request me are:

  1. Save all the integration files on a web server. Which should be public.
  2. Place in the header of your page the scripts of the company in the following order:
    1. Style Sheet of the company.
    2. SDK files of the company.
    3. App configuration

But I don’t know where should I place the integration files. Does Shopify has an own web server?

I’m new in app integrations.

I hope someone can help me.