add charge validation support

Author: christianjombo

src/Rave.php

@@ -82,6 +82,22 @@ public function getTransactionIDFromCallback()
         return $transactionID;
     }
 
+    /**
+     * Reaches out to Flutterwave to validate a charge
+     * @param $data
+     * @return object
+     */
+    public function validateCharge(array $data)
+    {
+
+        $payment = Http::withToken($this->secretKey)->post(
+            $this->baseUrl . '/validate-charge',
+            $data
+        )->json();
+
+        return $payment;
+    }
+
     /**
      * Reaches out to Flutterwave to verify a transaction
      * @param $id