python - Python を使用した Paypal トランザクション検索

Question

必要な認証の詳細があり、TransactionSearch を実行しようとしています。I keep getting an error: TIMESTAMP=2013%2d09%2d07T19%3a06%3a35Z&CORRELATIONID=b7af040415e92&ACK=Failure&VERSION=0%2e000000&BUILD=7507921&L_ERRORCODE0=10002&L_SHORTMESSAGE0=Authentication%2fAuthorization%20Failed&L_LONGMESSAGE0=You%20do%20not%20have%20permissions%20to%20make% 20this%20API%20call&L_SEVERITYCODE0=エラー

これが私のコードです：

(timestamp, signature) = signaturegen.getAuthHeader(apiUser=settings.USERNAME, apiPass=settings.PASSWORD, accessTok=res2["token"], secTok=res2["tokenSecret"], httpMethod="POST", scriptURI="https://api-3t.sandbox.paypal.com/nvp")    
#the above operation is used to generate the timestamp and signature

headers = {"X-PAYPAL-AUTHORIZATION": "timestamp="+<timestamp>+",token="+<token>+",signature="+<signature>, "SUBJECT": settings.<API_USERNAME>}

data = {
"METHOD": "TransactionSearch",
"STARTDATE": "2012-01-01T05:38:48Z",
}
req= urllib2.Request("https://api-3t.sandbox.paypal.com/nvp", simplejson.dumps(data), headers)
res = urllib2.urlopen(req).read()