diff --git a/acme/acme/client.py b/acme/acme/client.py
index 29b42c381..bdc07fb1c 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -16,7 +16,6 @@ from requests_toolbelt.adapters.source import SourceAddressAdapter
 import requests
 from requests.adapters import HTTPAdapter
 import sys
-import json
 
 from acme import crypto_util
 from acme import errors
@@ -833,35 +832,6 @@ class BackwardsCompatibleClientV2(object):
         """
         return self.client.revoke(cert, rsn)
 
-    def build_new_registration(self, email, kid=None, hmac_key=None, phone=None, **kwargs):
-        """Create registration resource from contact details."""
-        details = list(kwargs.pop('contact', ()))
-        if phone is not None:
-            details.append(messages.Registration.phone_prefix + phone)
-        if email is not None:
-            details.append(messages.Registration.email_prefix + email)
-        kwargs['contact'] = tuple(details)
-
-        if kid is not None and hmac_key is not None:
-            kwargs['external_account_binding'] = self.build_external_account_binding(kid, hmac_key)
-
-        return messages.NewRegistration(**kwargs)
-
-    def build_external_account_binding(self, kid, hmac_key):
-        account_public_key = self.client.net.key.public_key()
-        directory = self.client.directory
-
-        key_json = json.dumps(account_public_key.to_partial_json())
-        decoded_hmac_key = jose.b64.b64decode(hmac_key)
-        url = directory["newAccount"]
-
-        eab = jws.JWS.sign(key_json, jose.jwk.JWKOct(key=decoded_hmac_key),
-                           jose.jwa.HS256, None,
-                           url, kid)
-
-        return eab.to_partial_json()
-
-
     def _acme_version_from_directory(self, directory):
         if hasattr(directory, 'newNonce'):
             return 2
diff --git a/certbot/client.py b/certbot/client.py
index 649380acc..26d985662 100644
--- a/certbot/client.py
+++ b/certbot/client.py
@@ -196,10 +196,13 @@ def perform_registration(acme, config, tos_cb):
         if config.eab_kid is None or config.eab_hmac_key is None:
             raise errors.Error("Server requires external account binding. Please use --eab-kid and --eab-hmac-key.")
 
+    account_public_key = acme.client.net.key.public_key()
     try:
-        return acme.new_account_and_tos(acme.build_new_registration(config.eab_kid,
-                                                                    config.eab_hmac_key,
-                                                                    config.email),
+        return acme.new_account_and_tos(messages.NewRegistration.from_data(account_public_key=account_public_key,
+                                                                           kid=config.eab_kid,
+                                                                           hmac_key=config.eab_hmac_key,
+                                                                           email=config.email,
+                                                                           directory=acme.client.directory),
                                         tos_cb)
     except messages.Error as e:
         if e.code == "invalidEmail" or e.code == "invalidContact":