从QR码编码计算Reed-Solomon纠错码字

for a little project I'm asked to come up with a little QR-Code encoder in Go. After successfully completing the analysing and encoding part, I'm now trying to wrap my head around the error correction using the following package:

https://github.com/klauspost/reedsolomon

Essentially, I don't understand how to structure the data and parity shards inputs in connection with a specific QR-Code version and its specifications.

Thanks in advance.