小程序境外支付：小程序调用支付JSAPI缺少参数：total_fee，什么原因？

小程序境外支付调起支付参数：

{ 

  appId: ‘wx7732d8526b795c6f’,

  timeStamp: ‘1576753706’,

  nonceStr: ‘1576753705985’,

  package: ‘{“prepay_id”:“wx19190825264489afdc39a10b1791291809”}’,

  paySign: ‘LFY34x3cE7rlS5eaMXYFFVnimZwPusTmHqqMml/sCnX4q7fxSsqsKtERVyzH0RuuO4GhicMd+iNjaSmHg73r1QxXJnu+itg00ZDdcv8aGJD5QQbmn7hUkTdO/2UwJeE6YbWkLwbIDHBX6VaciAUdZjdCTEWfEZL7N4zgZuAR/Fvx/9s2JIWxSpCcIiu1fttwcoQw/O8jsDkSY0L2aCg6BG2sDUzPB/NgtCgb8gZ1HBMe/yuxlCFKBzpS5hxV6mWw5kVjSBhNl5YZLUqRSX880lAeJ3P90+bTZ8Dg4jdESMc/wonvZY7Xasc+iVLxQ+adijt2epf4xbKndJkZmSvd7g==’ }

报调用支付JSAPI缺少参数：total_fee