How to reuse a registration?

[martinnaj]

Hello,

Slight newbie to ACME, used to use certbot but it took forever so I made a script that uses lego as a lib. Currently using one registration per run of around 190 certs. The issue I am running into is, that occasionally I have to make certs on different machines for different sets of domains. I am registering on each run, so this hits a rate limit after a while, then I just have to wait until its over. I followed some of the example code https://go-acme.github.io/lego/usage/library/index.html but couldn't figure out how to correctly save data after registration and then load it again, to use the same user. Can someone help me out here by providing an example/something? I kept getting auth errors on my attempts of:

Using PK to load account
Using PK to load account with provided account URI
Re-registering with the same PK
and a few other random attempts

Any and all help is appreciated!