PaypalSandBox Transaction failed at one stage

  Hi, I am having the same problem. I replaced the file with the one given by your guys as suggested and I still have the problem. When I have the sandbox use box checked the checkout does not go to paypal and fails but when it is not checked it works and goes to paypal. Therefore I added the code (when use sandbox was checked) as and where you suggested and I get this back:

Direct Pay:
Full Request: n/a
Full Response: n/a


Express Authorize
Full Request: <?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Header><RequesterCredentials xmlns="urn:ebay:api:PayPalAPI"><Credentials xmlns="urn:ebay:apis:eBLBaseComponents"><Username>REMOVED</Username><Password>REMOVED</Password><Signature>REMOVED</Signature><Subject/></Credentials></RequesterCredentials></soap:Header><soap:Body><SetExpressCheckoutReq xmlns="urn:ebay:api:PayPalAPI"><SetExpressCheckoutRequest><Version xmlns="urn:ebay:apis:eBLBaseComponents">2.20</Version><SetExpressCheckoutRequestDetails xmlns="urn:ebay:apis:eBLBaseComponents"><OrderTotal currencyID="GBP">59.00</OrderTotal><ReturnURL>http://REMOVED/pp_confirm.php</ReturnURL><CancelURL>http://REMOVED/pp_cancel.php</CancelURL><PaymentAction>Authorization</PaymentAction></SetExpressCheckoutRequestDetails></SetExpressCheckoutRequest></SetExpressCheckoutReq></soap:Body></soap:Envelope>
Full Response: <?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:cc="urn:ebay:apis:CoreComponentTypes" xmlns:ed="urn:ebay:apis:EnhancedDataTypes" xmlns:wsu="http://schemas.xmlsoap.org/ws/2002/07/utility" xmlns:saml="urn:oasis:names:tc:SAML:1.0:assertion" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext" xmlns:ebl="urn:ebay:apis:eBLBaseComponents" xmlns:ns="urn:ebay:api:PayPalAPI"><SOAP-ENV:Header><Security xmlns="http://schemas.xmlsoap.org/ws/2002/12/secext" xsi:type="wsse:SecurityType"></Security><RequesterCredentials xmlns="urn:ebay:api:PayPalAPI" xsi:type="ebl:CustomSecurityHeaderType"><Credentials xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:UserIdPasswordType"><Username xsi:type="xs:string"></Username><Password xsi:type="xs:string"></Password><Signature xsi:type="xs:string">REMOVED</Signature><Subject xsi:type="xs:string"></Subject></Credentials></RequesterCredentials></SOAP-ENV:Header><SOAP-ENV:Body id="_0"><SetExpressCheckoutResponse xmlns="urn:ebay:api:PayPalAPI"><Timestamp xmlns="urn:ebay:apis:eBLBaseComponents">2010-07-08T10:15:53Z</Timestamp><Ack xmlns="urn:ebay:apis:eBLBaseComponents">Failure</Ack><CorrelationID xmlns="urn:ebay:apis:eBLBaseComponents">66e5cdeb451d4</CorrelationID><Errors xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:ErrorType"><ShortMessage xsi:type="xs:string">Security error</ShortMessage><LongMessage xsi:type="xs:string">Security header is not valid</LongMessage><ErrorCode xsi:type="xs:token">10002</ErrorCode><SeverityCode xmlns="urn:ebay:apis:eBLBaseComponents">Error</SeverityCode></Errors><Version xmlns="urn:ebay:apis:eBLBaseComponents">2.20</Version><Build xmlns="urn:ebay:apis:eBLBaseComponents">1366358</Build></SetExpressCheckoutResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>


Express Process:
Full Request: n/a
Full Response: n/a



Can you advise me what the problem is?
Thanks.