diff --git a/src/Rules/BAAS/Billet.php b/src/Rules/BAAS/Billet.php
index ccc64c9..c5ebcd9 100644
--- a/src/Rules/BAAS/Billet.php
+++ b/src/Rules/BAAS/Billet.php
@@ -8,11 +8,9 @@ public static function rules(): array
     {
         return [
             'externalId' => ['required'],
-            'merchantCategoryCode' => ['sometimes', 'required'],
             'expirationAfterPayment' => ['required', 'numeric', 'min:1'],
             'dueDate' => ['required', 'date', 'after:yesterday'],
             'amount' => ['required', 'decimal:0,2'],
-            'key' => ['required'],
             'debtor' => ['required', 'array'],
             'debtor.name' => ['required', 'string', 'max: 25'],
             'debtor.document' => ['required'],
diff --git a/src/Types/BAAS/Billet.php b/src/Types/BAAS/Billet.php
index de145e9..02b168c 100644
--- a/src/Types/BAAS/Billet.php
+++ b/src/Types/BAAS/Billet.php
@@ -7,11 +7,9 @@
 class Billet extends Data
 {
     public string $externalId;
-    public ?string $merchantCategoryCode;
     public int $expirationAfterPayment;
     public string $dueDate;
     public float $amount;
-    public ?string $key;
     /**
      * @var BilletDebtor
      */
diff --git a/tests/Integration/BAAS/CelcoinBASSBilletTest.php b/tests/Integration/BAAS/CelcoinBASSBilletTest.php
index 6c5def4..22fa50f 100644
--- a/tests/Integration/BAAS/CelcoinBASSBilletTest.php
+++ b/tests/Integration/BAAS/CelcoinBASSBilletTest.php
@@ -46,10 +46,8 @@ public static function billetBodyRequest(): Billet
         return new Billet([
             "externalId" => "externalId1",
             "expirationAfterPayment" => 1,
-            "merchantCatagoryCode" => "0000",
             "dueDate" => now()->format('Y-m-d'),
             "amount" => 12.5,
-            "key" => "testepix@celcoin.com.br",
             "debtor" => new BilletDebtor([
                 "name" => "João teste de teste",
                 "document" => "12345678910",