i want to integrate an API of an email marketing programe that i use, to the CRM and i don't know how.

Here is the API of the other software and the instructions.  http://envialosimple.com/es/api-http-email-marketing

...but i don't get how i can integrate one in an other.

First, is it possible to do this? I was told that yes it is.

Second, how do i have to do and where?

Third, thank you.

Regards,

Lucas.