diff --git a/API/bricks/payment.md b/API/bricks/payment.md
index ef87487..a9579a6 100644
--- a/API/bricks/payment.md
+++ b/API/bricks/payment.md
@@ -249,18 +249,18 @@ The callbacks object contains the callbacks functions the brick will call during
 {
     'payment_method_id': string,
     'transaction_amount': number,
-    'transaction_details?': {
+    'transaction_details'?: {
         'financial_institution': string,
     },
     'payer': {
         'email': string,
-        'identification?': {
+        'identification'?: {
             'type': string,
             'number': string
         },
-        'first_name?': string,
-        'last_name?': string,
-        'address?': {
+        'first_name'?: string,
+        'last_name'?: string,
+        'address'?: {
             'city': string,
             'federal_unit': string,
             'neighborhood': string,
@@ -269,9 +269,9 @@ The callbacks object contains the callbacks functions the brick will call during
             'zip_code': string
         }
     },
-    'metadata?': {
-        'payment_point?': string,
-        'payment_mode?': string
+    'metadata'?: {
+        'payment_point'?: string,
+        'payment_mode'?: string
     }
 }
 ```