diff --git a/app/Http/Middleware/VerifyHMAC.php b/app/Http/Middleware/VerifyHMAC.php
index 1c54c9c..6f1097c 100644
--- a/app/Http/Middleware/VerifyHMAC.php
+++ b/app/Http/Middleware/VerifyHMAC.php
@@ -50,7 +50,7 @@ public function handle(Request $request, Closure $next) {
 
 	public static function generateHMAC(string $url, string $datetime, array $payload): string {
 		ksort($payload);
-		$data = $url . $datetime . json_encode($payload);
+		$data = $url . ':' . $datetime . ':' . json_encode($payload);
 
 		return hash_hmac('sha256', $data, config('app.hmac.secret'));
 	}