diff --git a/lib/models/cardModel.js b/lib/models/cardModel.js
index f89fb88b..e7c82eca 100644
--- a/lib/models/cardModel.js
+++ b/lib/models/cardModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false, // Fails if an extra param is added to the model
+  additionalProperties: true, // Fails if an extra param is added to the model
   properties: {
     id: {
       type: 'string'
diff --git a/lib/models/cardTokenModel.js b/lib/models/cardTokenModel.js
index ac1248a6..75b17996 100644
--- a/lib/models/cardTokenModel.js
+++ b/lib/models/cardTokenModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false, // Fails if an extra param is added to the model
+  additionalProperties: true, // Fails if an extra param is added to the model
   properties: {
     id: {
       type: 'string'
diff --git a/lib/models/collectionsModel.js b/lib/models/collectionsModel.js
index 4527aa2a..32a87ca7 100644
--- a/lib/models/collectionsModel.js
+++ b/lib/models/collectionsModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false, // Fails if an extra param is added to the model
+  additionalProperties: true, // Fails if an extra param is added to the model
   properties: {
     id: {
       type: 'integer'
diff --git a/lib/models/customersModel.js b/lib/models/customersModel.js
index b855d9b7..5cd0d21a 100644
--- a/lib/models/customersModel.js
+++ b/lib/models/customersModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false,
+  additionalProperties: true,
   properties: {
     email: {
       type: 'string',
diff --git a/lib/models/discountCampaignModel.js b/lib/models/discountCampaignModel.js
index cd7e2a90..8b07312d 100644
--- a/lib/models/discountCampaignModel.js
+++ b/lib/models/discountCampaignModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false, // Fails if an extra param is added to the model
+  additionalProperties: true, // Fails if an extra param is added to the model
   properties: {
     id: {
       type: 'string'
diff --git a/lib/models/merchantOrdersModel.js b/lib/models/merchantOrdersModel.js
index 05b24790..b96221e7 100644
--- a/lib/models/merchantOrdersModel.js
+++ b/lib/models/merchantOrdersModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false,
+  additionalProperties: true,
   properties: {
     preference_id: {
       type: 'string'
diff --git a/lib/models/moneyRequestsModel.js b/lib/models/moneyRequestsModel.js
index 9fca81ee..509b4d68 100644
--- a/lib/models/moneyRequestsModel.js
+++ b/lib/models/moneyRequestsModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false,
+  additionalProperties: true,
   properties: {
     concept_type: {
       enum: ['on_platform', 'off_platform']
diff --git a/lib/models/preapprovalModel.js b/lib/models/preapprovalModel.js
index 8a699079..297f0aec 100644
--- a/lib/models/preapprovalModel.js
+++ b/lib/models/preapprovalModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false,
+  additionalProperties: true,
   properties: {
     payer_email: {
       type: 'string',
diff --git a/lib/models/preferencesModel.js b/lib/models/preferencesModel.js
index e152462d..d5838c40 100644
--- a/lib/models/preferencesModel.js
+++ b/lib/models/preferencesModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false,
+  additionalProperties: true,
   properties: {
     items: {
       type: 'array',
diff --git a/lib/models/refundModel.js b/lib/models/refundModel.js
index 7af9b54c..041695f3 100644
--- a/lib/models/refundModel.js
+++ b/lib/models/refundModel.js
@@ -1,6 +1,6 @@
 /* istanbul ignore next */
 module.exports = {
-  additionalProperties: false, // Fails if an extra param is added to the model
+  additionalProperties: true, // Fails if an extra param is added to the model
   properties: {
     id: {
       type: 'string'
diff --git a/test/validation.js b/test/validation.js
index 9f867339..d506c987 100644
--- a/test/validation.js
+++ b/test/validation.js
@@ -6,7 +6,7 @@ var validationModule = require('../lib/validation');
 
 describe('Validation Module', function () {
   var testSchema = {
-    additionalProperties: false,
+    additionalProperties: true,
     properties: {
       first_name: {
         type: 'string'