Beginners help on the Gateway Module WM1302

I have been using lora modules for a while , and want to use the Gateway Module WM1302 module. Is there any basic help on describing what each part of the board does, and do I only have to communicate with the 1302 chip, and this automatically talks to the other? I want to connect it to a STM32L4 chip to the WM1302 and communcate through the SPI.

Many thanks