ok

app/Libs/Pay/Merchants/UnionPay.php

@@ -126,7 +126,7 @@ class UnionPay implements PayMerchantInterface
         return $this->msgSrcId . date("YmdHis") . substr(uniqid(), 0, 12);
     }
 
-    private function makeSign(array $data)
+    public function makeSign(array $data)
     {
         //签名步骤一：按字典序排序参数
         ksort($data);