diff --git a/src/Authentication/AuthenticationMethod.php b/src/Authentication/AuthenticationMethod.php
index 18137c6..6367ba2 100644
--- a/src/Authentication/AuthenticationMethod.php
+++ b/src/Authentication/AuthenticationMethod.php
@@ -6,5 +6,13 @@
 
 abstract class AuthenticationMethod implements Arrayable
 {
-    //
+    public function toArray(): array
+    {
+        return [
+            'key' => 'Authorization',
+            'value' => sprintf('%s {{token}}', $this->prefix()),
+        ];
+    }
+
+    abstract public function prefix(): string;
 }
diff --git a/src/Authentication/Basic.php b/src/Authentication/Basic.php
index 7fb5837..c35e380 100644
--- a/src/Authentication/Basic.php
+++ b/src/Authentication/Basic.php
@@ -4,8 +4,8 @@
 
 class Basic extends AuthenticationMethod
 {
-    public function toArray(): array
+    public function prefix(): string
     {
-        return [];
+        return 'Basic';
     }
 }
diff --git a/src/Authentication/Bearer.php b/src/Authentication/Bearer.php
index e63e63d..814ce58 100644
--- a/src/Authentication/Bearer.php
+++ b/src/Authentication/Bearer.php
@@ -4,8 +4,8 @@
 
 class Bearer extends AuthenticationMethod
 {
-    public function toArray(): array
+    public function prefix(): string
     {
-        return [];
+        return 'Bearer';
     }
 }