How to obtain API key and integrate resume builder in angular apps

Hi Folks,
This is gowri shankar from India. And i need to know how to obtain a API key and the resources to integrate resume template service in our app.

As, we are creating a app where users can create a resume from preexisting templates and can either download them or save it to their GDrives.

If any of you have any experience in it or know how to do it then please guide me along with the pricing.

Yours Faithfully,
Gowri Shankar.D