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我在我的網站上使用PayPal REST API進行退款選項。 我使用PayPal測試帳戶訂購所有工作都很好，但是當我嘗試退款時，我收到「交易被拒絕」。我嘗試退還全部金額，部分金額，貨幣變化......沒有任何幫助。我也嘗試用新訂單和一些較舊的訂單（2天前）相同。 這裏我跑我所得到貝寶退款交易拒絕
curl -v https://api.sandbox.paypal.com/v1/payments/sale/*******/refund -H 'Content-Type:application/json' -H 'Authorization: Bearer ***********' -d '{"amount":{"total":"5.00","currency":"JPY"}}'
* About to connect() to api.sandbox.paypal.com port 443 (#0)
* Trying 173.0.82.78...
* Connected to api.sandbox.paypal.com (173.0.82.78) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* CAfile: /etc/pki/tls/certs/ca-bundle.crt
CApath: none
* NSS: client certificate not found (nickname not specified)
* SSL connection using SSL_RSA_WITH_3DES_EDE_CBC_SHA
* Server certificate:
* subject: CN=api.sandbox.paypal.com,OU=PayPal Production,O="PayPal, Inc.",L=San Jose,ST=California,C=US
* start date: Dec 06 00:00:00 2012 GMT
* expire date: Dec 06 23:59:59 2016 GMT
* common name: api.sandbox.paypal.com
* issuer: CN=VeriSign Class 3 Secure Server CA - G3,OU=Terms of use at https:// www.verisign.com/rpa (c)10,OU=VeriSign Trust Network,O="VeriSign, Inc.",C=US
> POST /v1/payments/sale/**********/refund HTTP/1.1
> User-Agent: curl/7.29.0
> Host: api.sandbox.paypal.com
> Accept: */*
> Content-Type:application/json
> Authorization: Bearer ******************
> Content-Length: 44
>
* upload completely sent off: 44 out of 44 bytes
< HTTP/1.1 400 Bad Request
< Server: Apache-Coyote/1.1
< Date: Sun, 25 Aug 2013 21:35:55 GMT
< Connection: close
< PayPal-Debug-Id: 6ccd19f66d117
< Content-Type: application/json
< Content-Length: 171
< Connection: close
<
* Closing connection 0
{"name":"TRANSACTION_REFUSED","message":"{0}","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#TRANSACTION_REFUSED","debug_id":"6ccd19f66d117"}
那麼什麼能問題？我檢查了關於PayPal給我的鏈接，他根本沒有幫我。 我需要儘快完成退款選項。