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微信支付APIV3 证书下载接口报400 badrequest?

参数都对过了,一直报400是什么原因,求帮忙

{Method: GET, RequestUri: 'https://api.mch.weixin.qq.com/v3/certificates', Version: 1.1, Content: <null>, Headers:

{

  Accept: application/json

  Authorization: WECHATPAY2-SHA256-RSA2048 mchid="1603208176",serial_no="1D495442C149141D49D5E02C9EF76B6CF094A3DA",nonce_str="jvx32sck.wsm",timestamp="1602565705",signature="zwrCoQVYaqtGYxlaFM1Ta2P20P8foPe2O9LEZyQ3EuTcfKsgo1R/bALmGu817ajrRLaVXPycR4KFqfDPKW/i/k0lWMUuhDYpqdSKP/CTiEznLB9VRLDepIZ8ksrupY4fbT9lZ1UdPiYWSKbJb4LKsd3RgBobiHN8En22i5tdgZcQG6TNOL+KsXgfAr0n4dPtYmkzXhrIzGEVsdAtaZZbu2a3Hu4+S7L1KirdMJT/382IT5V8jfKn0FVo86ydi3DVGxk6vCBwaSbCiQXRGMZELNe+qDkZ6GvEtRRqhPVT1sQgP9pM5kMQRdpX1UjOzTreKGZcZ/6uI6yhel71Ys0G1A=="

  Request-Id: |8266ef5f-42fd6a0a8635a253.1.

}}

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