I am confused about the Connectivity Settings for Analyze Site. I hope someone can help.

1) There are fields for Google API Key, Moz Access ID, and Moz Secret Key. So does this mean all 3 are required, or only one or the other?
2) Are these things that are given to me when I sign up and pay for Analyze Site and all I do is fill in the fields with the details given me?
3) Or, are these things I must acquire myself? (Moz is not cheap.)
4) If these are things I must get myself, will the system accept the Moz Links Api - Free Trial Plan?

Any help or guidance would be very much appreciated.

Thank you.