diff --git a/src/Coinbase.php b/src/Coinbase.php
index 4b09589..c09752c 100755
--- a/src/Coinbase.php
+++ b/src/Coinbase.php
@@ -120,7 +120,7 @@ public function getCheckouts(): array
      * @param  array  $params
      * @return array
      */
-    public function createCheckout(array $params = []): array
+    public function createCheckout(array $params): array
     {
         return $this->makeRequest('post', 'checkouts', [], $params);
     }
diff --git a/src/Facades/Coinbase.php b/src/Facades/Coinbase.php
index 66ff005..cfc7d90 100755
--- a/src/Facades/Coinbase.php
+++ b/src/Facades/Coinbase.php
@@ -11,7 +11,7 @@
  * @method static array cancelCharge(string $chargeId) Cancels an existing charge by supplying its id or 8 character short-code.
  * @method static array resolveCharge(string $chargeId) Resolves an existing, unresolved charge by supplying its id or 8 character short-code.
  * @method static array getCheckouts() Lists all checkouts.
- * @method static array createCheckout(array $params = []) Creates a new checkout.
+ * @method static array createCheckout(array $params) Creates a new checkout.
  * @method static array getCheckout(string $checkoutId) Retrieves an existing checkout.
  * @method static array updateCheckout(string $checkoutId, array $params = []) Updates an existing checkout.
  * @method static array deleteCheckout(string $checkoutId) Deletes an existing checkout.