No documents, no schematics - how to work with this thing?

I already purchased one elsewhere and didn't realize it was meant to work with another module. The links above have the datasheet, and the rar file contains schematics. Since it uses SPI interface it should be fairly straightforward. The pins are marked on the top.

Sipeed - Mic Arrary

I'm going to play with it myself with some ESP type boards I have.

How do we connect this to raspberry pi?