diff --git a/backend/bdd/features/steps/pki_acme.py b/backend/bdd/features/steps/pki_acme.py
index f38410f0d..9a84b0dc8 100644
--- a/backend/bdd/features/steps/pki_acme.py
+++ b/backend/bdd/features/steps/pki_acme.py
@@ -92,4 +92,4 @@ def step_impl(context: Context):
 def step_impl(context: Context, email: str, kid: str, secret: str, account_var: str):
     # TODO: add EAB info here
     registration = messages.NewRegistration.from_data(email=email)
-    context.var[account_var] = context.acme_client.new_account(registration)
+    context.vars[account_var] = context.acme_client.new_account(registration)
diff --git a/backend/src/ee/routes/v1/pki-acme-router.ts b/backend/src/ee/routes/v1/pki-acme-router.ts
index f9342a825..2a82bfeb3 100644
--- a/backend/src/ee/routes/v1/pki-acme-router.ts
+++ b/backend/src/ee/routes/v1/pki-acme-router.ts
@@ -27,6 +27,20 @@ import {
 } from "@app/ee/services/pki-acme/pki-acme-schemas";
 
 export const registerPkiAcmeRouter = async (server: FastifyZodProvider) => {
+  server.addContentTypeParser("application/jose+json", { parseAs: "string" }, (_, body, done) => {
+    try {
+      const strBody = body instanceof Buffer ? body.toString() : body;
+      if (!strBody) {
+        done(null, undefined);
+      }
+      const json: unknown = JSON.parse(strBody as string);
+      // TODO: deal with JWS payload here
+      done(null, json);
+    } catch (err) {
+      const error = err as Error;
+      done(error, undefined);
+    }
+  });
   // GET /api/v1/pki/acme/profiles/<profile_id>/directory
   // Directory (RFC 8555 Section 7.1.1)
   server.route({
@@ -94,7 +108,10 @@ export const registerPkiAcmeRouter = async (server: FastifyZodProvider) => {
     },
     handler: async (req, res) => {
       const account = await server.services.pkiAcme.createAcmeAccount(req.params.profileId, req.body);
+      // TODO: deal with existing account case here
       res.code(201);
+      const nonce = await server.services.pkiAcme.getAcmeNewNonce(req.params.profileId);
+      res.header("Replay-Nonce", nonce);
       return account;
     }
   });
diff --git a/backend/src/ee/services/pki-acme/pki-acme-schemas.ts b/backend/src/ee/services/pki-acme/pki-acme-schemas.ts
index 6cfee8ecc..2f470f834 100644
--- a/backend/src/ee/services/pki-acme/pki-acme-schemas.ts
+++ b/backend/src/ee/services/pki-acme/pki-acme-schemas.ts
@@ -11,7 +11,7 @@ export const GetAcmeDirectoryResponseSchema = z.object({
   newNonce: z.string(),
   newAccount: z.string(),
   newOrder: z.string(),
-  revokeCert: z.string()
+  revokeCert: z.string().optional()
 });
 
 // New Nonce endpoint
diff --git a/backend/src/ee/services/pki-acme/pki-acme-service.ts b/backend/src/ee/services/pki-acme/pki-acme-service.ts
index 1ece387e0..1148dda3d 100644
--- a/backend/src/ee/services/pki-acme/pki-acme-service.ts
+++ b/backend/src/ee/services/pki-acme/pki-acme-service.ts
@@ -1,3 +1,4 @@
+import { getConfig } from "@app/lib/config/env";
 import { NotFoundError } from "@app/lib/errors";
 
 import { TCertificateProfileDALFactory } from "@app/services/certificate-profile/certificate-profile-dal";
@@ -21,20 +22,24 @@ type TPkiAcmeServiceFactoryDep = {
 };
 
 export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeServiceFactoryDep): TPkiAcmeServiceFactory => {
+  const appCfg = getConfig();
+
   const getAcmeDirectory = async (profileId: string): Promise<TGetAcmeDirectoryResponse> => {
     // FIXME: Implement ACME directory endpoint
     // Validate profile exists and is for ACME enrollment
-    const profile = await certificateProfileDAL.findById(profileId);
-    if (!profile) {
-      throw new NotFoundError({ message: "Certificate profile not found" });
-    }
+    // const profile = await certificateProfileDAL.findById(profileId);
+    // if (!profile) {
+    //   throw new NotFoundError({ message: "Certificate profile not found" });
+    // }
 
     // FIXME: Validate profile is configured for ACME enrollment
+
+    // Return absolute URLs using SITE_URL
+    const baseUrl = appCfg.SITE_URL ?? "";
     return {
-      newNonce: `/api/v1/pki/acme/profiles/${profileId}/new-nonce`,
-      newAccount: `/api/v1/pki/acme/profiles/${profileId}/new-account`,
-      newOrder: `/api/v1/pki/acme/profiles/${profileId}/new-order`,
-      revokeCert: `/api/v1/pki/acme/profiles/${profileId}/revoke-cert`
+      newNonce: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/new-nonce`,
+      newAccount: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/new-account`,
+      newOrder: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/new-order`
     };
   };
 
@@ -48,23 +53,26 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
     // FIXME: Implement ACME new account registration
     // Use EAB authentication to find corresponding Infisical machine identity
     // Check permissions and return account information
+    const baseUrl = appCfg.SITE_URL || "";
+    const accountId = "FIXME-account-id";
     return {
       status: "valid",
-      accountUrl: `/api/v1/pki/acme/profiles/${profileId}/accounts/FIXME-account-id`,
+      accountUrl: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/accounts/${accountId}`,
       contact: [],
-      orders: `/api/v1/pki/acme/profiles/${profileId}/accounts/FIXME-account-id/orders`
+      orders: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/accounts/${accountId}/orders`
     };
   };
 
   const createAcmeOrder = async (profileId: string, body: unknown): Promise<TCreateAcmeOrderResponse> => {
     // FIXME: Implement ACME new order creation
     const orderId = "FIXME-order-id";
+    const baseUrl = appCfg.SITE_URL || "";
     return {
       status: "pending",
       expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
       identifiers: [],
       authorizations: [],
-      finalize: `/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`
+      finalize: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`
     };
   };
 
@@ -87,12 +95,13 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
 
   const getAcmeOrder = async (profileId: string, orderId: string): Promise<TGetAcmeOrderResponse> => {
     // FIXME: Implement ACME get order
+    const baseUrl = appCfg.SITE_URL || "";
     return {
       status: "pending",
       expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
       identifiers: [],
       authorizations: [],
-      finalize: `/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`
+      finalize: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`
     };
   };
 
@@ -102,13 +111,14 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
     csr: string
   ): Promise<TFinalizeAcmeOrderResponse> => {
     // FIXME: Implement ACME finalize order
+    const baseUrl = appCfg.SITE_URL || "";
     return {
       status: "processing",
       expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
       identifiers: [],
       authorizations: [],
-      finalize: `/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`,
-      certificate: `/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/certificate`
+      finalize: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/finalize`,
+      certificate: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/orders/${orderId}/certificate`
     };
   };
 
@@ -120,6 +130,7 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
 
   const getAcmeAuthorization = async (profileId: string, authzId: string): Promise<TGetAcmeAuthorizationResponse> => {
     // FIXME: Implement ACME authorization retrieval
+    const baseUrl = appCfg.SITE_URL || "";
     return {
       status: "pending",
       expires: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
@@ -130,7 +141,7 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
       challenges: [
         {
           type: "http-01",
-          url: `/api/v1/pki/acme/profiles/${profileId}/authorizations/${authzId}/challenges/http-01`,
+          url: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/authorizations/${authzId}/challenges/http-01`,
           status: "pending",
           token: "FIXME-challenge-token"
         }
@@ -144,9 +155,10 @@ export const pkiAcmeServiceFactory = ({ certificateProfileDAL }: TPkiAcmeService
   ): Promise<TRespondToAcmeChallengeResponse> => {
     // FIXME: Implement ACME challenge response
     // Trigger verification process
+    const baseUrl = appCfg.SITE_URL || "";
     return {
       type: "http-01",
-      url: `/api/v1/pki/acme/profiles/${profileId}/authorizations/${authzId}/challenges/http-01`,
+      url: `${baseUrl}/api/v1/pki/acme/profiles/${profileId}/authorizations/${authzId}/challenges/http-01`,
       status: "pending",
       token: "FIXME-challenge-token"
     };