Step by step guide

Hi
I would like to develop my own client of the ACME protocol. Beyond the RFC, is there any documentation I can follow to guide me in the development ?
The client would be developed in PHP but I do not want to rely on any third party module.
Best
Fx

You should also check out the aspects of Boulder (the Let’s Encrypt CA software) which diverge from the ACME spec: https://github.com/letsencrypt/boulder/blob/master/docs/acme-divergences.md

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