account_key.json is a required plugin

why make it a plugin, then, you may ask.
or perhaps you may not ask.

nixos/modules/issuer.nix

@@ -129,7 +129,7 @@ in {
           email = "jean-paul@privatestorage.io";
           postRun = "systemctl restart zkapissuer.service";
           webroot = "${acme}/acme-challenges";
-          plugins = [ "full.pem" "fullchain.pem" "key.pem" ];
+          plugins = [ "account_key.json" "full.pem" "fullchain.pem" "key.pem" ];
         };
       }
       else {};

nixos/pkgs/zkapissuer-repo.nix

@@ -4,6 +4,6 @@ in
   pkgs.fetchFromGitHub {
     owner = "PrivateStorageio";
     repo = "PaymentServer";
-    rev = "0acf43493a7525b0eba01b1c69fb69b41f411ecc";
-    sha256 = "0zaqm6qmylclxn25vghafwqxpm5h13c727x3zjnqgp7vbmi2aglk";
+    rev = "028d26152eba4f034aba405caa17627a764c2bbe";
+    sha256 = "06hdln97r2ign7phf661wlzh3z06bk9906lvc0gm3lh1pa23d3gb";
   }
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