diff --git a/lib/Document.js b/lib/Document.js
index 18fcd72..8496a00 100755
--- a/lib/Document.js
+++ b/lib/Document.js
@@ -301,21 +301,18 @@ function Document(newDocument = {}) {
 
   this.getFiles = function () {
     return document.files.map(function (file) {
-      file = _.mapKeys(file, function(v, k ){ return _.camelCase(k); });
       return file instanceof File ? file : new File(file);
     });
   };
 
   this.getRecipients = function () {
     return document.recipients.map(function (recip) {
-      recip = _.mapKeys(recip, function(v, k ){ return _.camelCase(k); });
       return recip instanceof Recipient ? recip : new Recipient(recip);
     });
   };
 
   this.getSigners = function () {
     return document.signers.map(function (signer) {
-      signer = _.mapKeys(signer, function(v, k ){ return _.camelCase(k); });
       return signer instanceof Signer ? signer : new Signer(signer);
     });
   };
@@ -477,7 +474,6 @@ function Document(newDocument = {}) {
 
   this.getLog = function () {
     return document.log.map(function (log) {
-      log = _.mapKeys(log, function(v, k ){ return _.camelCase(k); });
       return log instanceof LogEntry ? log : new LogEntry(log);
     });
   };
@@ -497,7 +493,6 @@ function Document(newDocument = {}) {
   this.getFields = function () {
     return document.fields.map(function (fieldsPerFile) {
       return fieldsPerFile.map(function (field) {
-        field = _.mapKeys(field, function(v, k ){ return _.camelCase(k); });
         return field instanceof FormField ? field : new FormField(field);
       });
       //return field instanceof FormField ? field : new FormField(field);
diff --git a/lib/DocumentTemplate.js b/lib/DocumentTemplate.js
index e698a73..d55c3d6 100755
--- a/lib/DocumentTemplate.js
+++ b/lib/DocumentTemplate.js
@@ -194,7 +194,6 @@ function Template(templateId) {
 
   this.getSigners = function () {
     return template.signers.map(function (signer) {
-      signer = _.mapKeys(signer, function(v, k ){ return _.camelCase(k); });
       return signer instanceof Signer ? signer : new Signer(signer);
     });
   };
diff --git a/lib/Request.js b/lib/Request.js
index e8a56c5..6e0ce21 100755
--- a/lib/Request.js
+++ b/lib/Request.js
@@ -11,6 +11,7 @@ var Document = require('./Document.js');
 var Business = require('./Business.js');
 var File = require('./File.js');
 var DocumentTemplate = require('./DocumentTemplate.js');
+var utils = require('./utils');
 
 module.exports = ApiRequest;
 
@@ -91,9 +92,7 @@ ApiRequest.prototype.requestOAuthToken = function requestOAuthToken(token_reques
     var self = this;
 
     token_request = token_request.toObject();
-    token_request = _.mapKeys(token_request, function(value, key) {
-        return _.snakeCase(key);
-    });
+    token_request = utils.mapKeysDeep(token_request, _.snakeCase);
 
     var requestOptions = {
         method: 'POST',
@@ -124,9 +123,7 @@ ApiRequest.prototype.requestOAuthToken = function requestOAuthToken(token_reques
 ApiRequest.prototype.startRequest = function(){
   var self = this;
 
-  this.payload = _.mapKeys(this.payload, function(value, key) {
-    return _.snakeCase(key);
-  });
+  this.payload = utils.mapKeysDeep(this.payload, _.snakeCase)
 
   var requestOptions = {
     method: this.httpType,
@@ -149,13 +146,13 @@ ApiRequest.prototype.startRequest = function(){
           if(res.length){
             //is an array
             var result = res.map(function (obj) {
-              obj = _.mapKeys(obj, function(v, k ){ return _.camelCase(k); });
+              obj = utils.mapKeysDeep(obj, _.camelCase);
               return new Type(obj);
             })
             return resolve(result);
           }else{
             //Not an array, or empty
-            res = _.mapKeys(res, function(v, k ){ return _.camelCase(k); });
+            res = utils.mapKeysDeep(res, _.camelCase);
             return resolve(new Type(res));
           }
         } else {
diff --git a/lib/utils.js b/lib/utils.js
new file mode 100644
index 0000000..e772dd3
--- /dev/null
+++ b/lib/utils.js
@@ -0,0 +1,16 @@
+var _ = require('lodash');
+
+/**
+ * Replace given object keys recursively
+ * @param {Object} object Object to change keys of
+ * @param {Function} transformer A callback which receives a key
+ * @returns Copy of the object with `transformer` applied to each key
+ */
+function mapKeysDeep(object, transformer) {
+  return _.transform(object, function (result, value, key) {
+    if (_.isFunction(value)) return;
+    result[transformer(key)] = _.isObject(value) ? mapKeysDeep(value, transformer) : value;
+  });
+}
+
+module.exports = { mapKeysDeep };
diff --git a/package-lock.json b/package-lock.json
index 9cd3f2d..2260344 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "eversign",
-  "version": "1.9.6",
+  "version": "1.9.7",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "eversign",
-      "version": "1.9.6",
+      "version": "1.9.7",
       "license": "MIT",
       "dependencies": {
         "bluebird": "^3.7.2",
diff --git a/typings/index.d.ts b/typings/index.d.ts
index 3d4879a..8a9884d 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -802,7 +802,7 @@ declare module 'eversign/lib/Signer' {
         getStatus(): Signer.STATUS
         getViewed(): boolean
         setDeclined(newDeclined: boolean): void
-        setDeliverEmail(newDeliverEmail: string): void
+        setDeliverEmail(newDeliverEmail: boolean): void
         setEmail(newEmail: string): void
         setEmbeddedSigningUrl(newEmbeddedSigningUrl: string): void
         setId(newId: number): void