diff -r 000000000000 -r 6474c204b198 mobile/android/base/background/fxa/FxAccount20CreateDelegate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/background/fxa/FxAccount20CreateDelegate.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.background.fxa;
+
+import java.io.UnsupportedEncodingException;
+import java.security.GeneralSecurityException;
+
+import org.json.simple.JSONObject;
+import org.mozilla.gecko.background.fxa.FxAccountClient10.CreateDelegate;
+import org.mozilla.gecko.sync.Utils;
+
+public class FxAccount20CreateDelegate implements CreateDelegate {
+  protected final byte[] emailUTF8;
+  protected final byte[] authPW;
+  protected final boolean preVerified;
+
+  /**
+   * Make a new "create account" delegate.
+   *
+   * @param emailUTF8
+   *          email as UTF-8 bytes.
+   * @param quickStretchedPW
+   *          quick stretched password as bytes.
+   * @param preVerified
+   *          true if account should be marked already verified; only effective
+   *          for non-production auth servers.
+   * @throws UnsupportedEncodingException
+   * @throws GeneralSecurityException
+   */
+  public FxAccount20CreateDelegate(byte[] emailUTF8, byte[] quickStretchedPW, boolean preVerified) throws UnsupportedEncodingException, GeneralSecurityException {
+    this.emailUTF8 = emailUTF8;
+    this.authPW = FxAccountUtils.generateAuthPW(quickStretchedPW);
+    this.preVerified = preVerified;
+  }
+
+  @SuppressWarnings("unchecked")
+  @Override
+  public JSONObject getCreateBody() throws FxAccountClientException {
+    final JSONObject body = new JSONObject();
+    try {
+      body.put("email", new String(emailUTF8, "UTF-8"));
+      body.put("authPW", Utils.byte2Hex(authPW));
+      if (preVerified) {
+        // Production endpoints do not allow preVerified; this assumes we only
+        // set it when it's okay to send it.
+        body.put("preVerified", preVerified);
+      }
+      return body;
+    } catch (UnsupportedEncodingException e) {
+      throw new FxAccountClientException(e);
+    }
+  }
+}