Change logic to look for the text field to determine the type of webhook (#364)

Author: SecondeJK

src/SMS/Webhook/DeliveryReceipt.php

@@ -270,7 +270,7 @@ public function getPrice(): string
         return $this->price;
     }
 
-    public function getScts(): string
+    public function getScts(): ?string
     {
         return $this->scts;
     }

src/SMS/Webhook/Factory.php

@@ -29,7 +29,10 @@ class Factory extends WebhookFactory
      */
     public static function createFromArray(array $data)
     {
-        if (array_key_exists('scts', $data)) {
+        // We are dealing with only two webhooks here. One has the text field, one does not.
+        // A sort of if/else style block here smells a bit, ideally the backend needs to change.
+
+        if (!array_key_exists('text', $data)) {
             return new DeliveryReceipt($data);
         }