diff --git a/app/Http/Requests/Setting/Module.php b/app/Http/Requests/Setting/Module.php
index 82e6108ef..ea2908005 100644
--- a/app/Http/Requests/Setting/Module.php
+++ b/app/Http/Requests/Setting/Module.php
@@ -27,12 +27,16 @@ class Module extends FormRequest
 
         $module = module($this->request->get('module_alias'));
 
-        if ($module->get('settings')) {
-            foreach ($module->get('settings') as $field) {
-                if (isset($field['attributes']['required'])) {
-                    $rules[$field['name']] = $field['attributes']['required'];
-                }
+        if (!$fields = $module->get('settings')) {
+            return $rules;
+        }
+
+        foreach ($fields as $field) {
+            if (empty($field['rules'])) {
+                continue;
             }
+
+            $rules[$field['name']] = $field['rules'];
         }
 
         return $rules;
diff --git a/app/Models/Banking/Transfer.php b/app/Models/Banking/Transfer.php
index 554875b9d..79cb83247 100644
--- a/app/Models/Banking/Transfer.php
+++ b/app/Models/Banking/Transfer.php
@@ -32,7 +32,7 @@ class Transfer extends Model
 
     public function expense_account()
     {
-        return $this->belongsTo('App\Models\Banking\Account', 'expense_transaction.account_id', 'id');
+        return $this->belongsTo('App\Models\Banking\Account', 'expense_transaction.account_id', 'id')->withDefault(['name' => trans('general.na')]);
     }
 
     public function income_transaction()
@@ -42,6 +42,6 @@ class Transfer extends Model
 
     public function income_account()
     {
-        return $this->belongsTo('App\Models\Banking\Account', 'income_transaction.account_id', 'id');
+        return $this->belongsTo('App\Models\Banking\Account', 'income_transaction.account_id', 'id')->withDefault(['name' => trans('general.na')]);
     }
 }
diff --git a/composer.json b/composer.json
index 49cf4b320..b3995c435 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
         "bkwld/cloner": "3.6.*",
         "consoletvs/charts": "6.5.*",
         "doctrine/dbal": "2.9.*",
-        "dingo/api": "3.0.0-rc3",
+        "dingo/api": "3.0.*",
         "fideloper/proxy": "^4.2",
         "fruitcake/laravel-cors": "^1.0",
         "genealabs/laravel-model-caching": "0.8.*",
diff --git a/config/services.php b/config/services.php
index 2a1d616c7..f88a89335 100644
--- a/config/services.php
+++ b/config/services.php
@@ -30,4 +30,8 @@ return [
         'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),
     ],
 
+    'sendgrid' => [
+        'api_key' => env('SENDGRID_API_KEY'),
+    ],
+
 ];
diff --git a/modules/PaypalStandard/module.json b/modules/PaypalStandard/module.json
index ce0827c1d..fc7ed3410 100644
--- a/modules/PaypalStandard/module.json
+++ b/modules/PaypalStandard/module.json
@@ -20,7 +20,8 @@
             "icon": "fa fa-font",
             "attributes": {
                 "required": "required"
-            }
+            },
+            "rules": "required|string"
         },
         {
             "type": "textGroup",
@@ -29,7 +30,8 @@
             "icon": "envelope",
             "attributes": {
                 "required": "required"
-            }
+            },
+            "rules": "required|email"
         },
         {
             "type": "selectGroup",
@@ -40,8 +42,11 @@
                 "live": "Live",
                 "sandbox": "Sandbox"
             },
-            "selected": null,
-            "attributes": {}
+            "selected": "live",
+            "attributes": {
+                "required": "required"
+            },
+            "rules": "required|string"
         },
         {
             "type": "selectGroup",
@@ -52,8 +57,11 @@
                 "authorization": "Authorization",
                 "sale": "Sale"
             },
-            "selected": null,
-            "attributes": {}
+            "selected": "sale",
+            "attributes": {
+                "required": "required"
+            },
+            "rules": "required|string"
         },
         {
             "type": "radioGroup",
@@ -61,7 +69,8 @@
             "title": "paypal-standard::general.form.customer",
             "enable": "general.yes",
             "disable": "general.no",
-            "attributes": {}
+            "attributes": {},
+            "rules": "required|integer"
         },
         {
             "type": "radioGroup",
@@ -69,14 +78,16 @@
             "title": "paypal-standard::general.form.debug",
             "enable": "general.yes",
             "disable": "general.no",
-            "attributes": {}
+            "attributes": {},
+            "rules": "required|integer"
         },
         {
             "type": "textGroup",
             "name": "order",
             "title": "paypal-standard::general.form.order",
             "icon": "sort",
-            "attributes": {}
+            "attributes": {},
+            "rules": "nullable|integer"
         }
     ]
 }