diff --git a/src/rules.php b/src/rules.php
new file mode 100644
index 0000000..04560f5
--- /dev/null
+++ b/src/rules.php
@@ -0,0 +1,9 @@
+<?php
+
+function pixCobrancaImediataRules(array $data){
+    $rules = [
+        'valor' => 'required|integer',
+        'expiracao' => 'integer',
+        'devedor' => 'sometimes|string'
+    ];
+}