Share permissions with apps

[Thales Maciel]

Hi, I'm working on a project to make an add-on for google sheets for my company. The idea is simple: get Google Ads and Facebook Ads data through the API's. 

There are about 5 or 6 Add-ons that are able to do It, but since Google Ads API is almost tailored to not work with GAS, I'm wondering if I can make an Add-on that calls an external app. Does anyone know if this is possible?

Thanks

[Eric Koleda]

You can use UrlFetchApp to make an HTTP call to another API, and there is an OAuth2 library you can use if the target API requires OAuth2 authorization.

- Eric

[Ievgen Krasovytskyi]

If that's still relevant to you - we covered all that in our free connector library. 
You can check the code inside our github
https://github.com/OWOX/owox-data-marts