您好，两个问题：
1.沙箱key是一次性的吗，每次API调用都得重新生成一次，还是说只要生成一次就可以保存下来重复使用呢，
2.生成沙箱key用到的nonce_str和微信各API里面用到的nonce_str有关系吗？
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这里指的是支付的沙箱环境？