Address review comments

README.md

@@ -2,8 +2,9 @@
 
 ## Description
 
-Let's Encrypt certificates in the Juju ecosystem for answering the DNS-01
-challenge through the HTTP Request plugin.
+ACME operator implementing the provider side of the `tls-certificates`
+interface to get signed certificates from the `Let's Encrypt` ACME server
+using the HTTP Request plugin for DNS-01 challenge.
 
 # Pre-requisites
 
@@ -17,6 +18,7 @@ Create a YAML configuration file with the following fields:
 ```yaml
 httpreq-acme-operator:
   email: <Account email address>
+  httpreq_endpoint: <HTTP/HTTPS URL>
 ```
 
 Deploy `httpreq-acme-operator`:
@@ -36,10 +38,17 @@ juju relate httpreq-acme-operator:certificates <tls-certificates-requirer>
 ### Required configuration properties
 
 - email: Let's Encrypt email address
+- httpreq_endpoint: HTTP/HTTPS URL to the service implementing the HTTPREQ API
 
 ### Optional configuration properties
 
 - server: Let's Encrypt server to use (default: `https://acme-v02.api.letsencrypt.org/directory`)
+- httpreq_http_timeout: API request timeout
+- httpreq_mode: "'RAW' or None"
+- httpreq_password: Basic authentication password
+- httpreq_polling_interval: Time between DNS propagation checks
+- httpreq_propagation_timeout: Maximum waiting time for DNS propagation
+- httpreq_username: Basic authentication username
 
 ## Relations
 

src/charm.py

@@ -18,10 +18,6 @@
 class HTTPReqAcmeOperatorCharm(AcmeClient):
     """Main class that is instantiated every time an event occurs."""
 
-    REQUIRED_CONFIG = [
-        "HTTPREQ_ENDPOINT",
-    ]
-
     def __init__(self, *args):
         """Uses the acme_client library to manage events."""
         super().__init__(*args, plugin="httpreq")