added base64 for safe-url format and added pwa for phone

app/Services/BillplzService.php

@@ -279,9 +279,29 @@ class BillplzService
     }
     
     protected function isBase64($string) {
+        if($this->isBase64UrlSafe($string)){
+            return true;
+        }
+
         if (preg_match('/^[A-Za-z0-9+\/=]+$/', $string)) {
             return base64_encode(base64_decode($string, true)) === $string;
         }
         return false;
     }
+    
+    protected function isBase64UrlSafe($string) {
+        // Convert URL-safe Base64 to standard Base64
+        $standardBase64 = str_replace(['-', '_'], ['+', '/'], $string);
+    
+        // Add padding if necessary
+        $remainder = strlen($standardBase64) % 4;
+        if ($remainder > 0) {
+            $standardBase64 .= str_repeat('=', 4 - $remainder);
+        }
+    
+        // Attempt to decode the string
+        $decoded = base64_decode($standardBase64, true);
+    
+        return $decoded !== false; // Return true if it successfully decodes
+    }
 }