I replaced anything that looked unique and not generic code:
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>CORRECTEMAILREMOVED</Username><Password></Password><Signature></Signature><Subject/></Credentials></RequesterCredentials></soap:Header><soap:Body><SetExpressCheckoutReq xmlns="urn:ebay:api:PayPalAPI"><SetExpressCheckoutRequest><Version xmlns="urn:ebay:apis:eBLBaseComponents">60.0</Version><SetExpressCheckoutRequestDetails xmlns="urn:ebay:apis:eBLBaseComponents"><ReturnURL>pp_confirm.php</ReturnURL><CancelURL>pp_cancel.php</CancelURL><PaymentAction>Authorization</PaymentAction><PaymentDetails><OrderTotal currencyID="USD">5.00</OrderTotal></PaymentDetails></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"></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">2010-08-06T23:13:38Z</Timestamp><Ack xmlns="urn:ebay:apis:eBLBaseComponents">Failure</Ack><CorrelationID xmlns="urn:ebay:apis:eBLBaseComponents">CONTENTREMOVED</CorrelationID><Errors xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:ErrorType"><ShortMessage xsi:type="xs:string">Authentication/Authorization Failed</ShortMessage><LongMessage xsi:type="xs:string">You do not have permissions to make this API call</LongMessage><ErrorCode xsi:type="xs:token">10002</ErrorCode><SeverityCode xmlns="urn:ebay:apis:eBLBaseComponents">Error</SeverityCode></Errors><Version xmlns="urn:ebay:apis:eBLBaseComponents">60.0</Version><Build xmlns="urn:ebay:apis:eBLBaseComponents">CONTENTREMOVED</Build></SetExpressCheckoutResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>
Express Process: 
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>CORRECTEMAILREMOVED</Username><Password></Password><Signature></Signature><Subject/></Credentials></RequesterCredentials></soap:Header><soap:Body><DoExpressCheckoutPaymentReq xmlns="urn:ebay:api:PayPalAPI"><DoExpressCheckoutPaymentRequest><Version xmlns="urn:ebay:apis:eBLBaseComponents">60.0</Version><DoExpressCheckoutPaymentRequestDetails xmlns="urn:ebay:apis:eBLBaseComponents"><Token></Token><PaymentAction>Sale</PaymentAction><PayerID></PayerID><PaymentDetails><OrderTotal currencyID="USD">5.00</OrderTotal><ItemTotal currencyID="USD">5</ItemTotal><ButtonSource>WebAssist.eCartPHP.Pro.ECO</ButtonSource><PaymentDetailsItem><Name>TEST Button</Name><Amount currencyID="USD">5</Amount><Quantity>1</Quantity></PaymentDetailsItem></PaymentDetails></DoExpressCheckoutPaymentRequestDetails></DoExpressCheckoutPaymentRequest></DoExpressCheckoutPaymentReq></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"></Signature><Subject xsi:type="xs:string"></Subject></Credentials></RequesterCredentials></SOAP-ENV:Header><SOAP-ENV:Body id="_0"><DoExpressCheckoutPaymentResponse xmlns="urn:ebay:api:PayPalAPI"><Timestamp xmlns="urn:ebay:apis:eBLBaseComponents">2010-08-06T22:17:59Z</Timestamp><Ack xmlns="urn:ebay:apis:eBLBaseComponents">Failure</Ack><CorrelationID xmlns="urn:ebay:apis:eBLBaseComponents">CONTENTREMOVED</CorrelationID><Errors xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:ErrorType"><ShortMessage xsi:type="xs:string">Authentication/Authorization Failed</ShortMessage><LongMessage xsi:type="xs:string">You do not have permissions to make this API call</LongMessage><ErrorCode xsi:type="xs:token">10002</ErrorCode><SeverityCode xmlns="urn:ebay:apis:eBLBaseComponents">Error</SeverityCode></Errors><Version xmlns="urn:ebay:apis:eBLBaseComponents">60.0</Version><Build xmlns="urn:ebay:apis:eBLBaseComponents">CONTENTREMOVED</Build><DoExpressCheckoutPaymentResponseDetails xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:DoExpressCheckoutPaymentResponseDetailsType"></DoExpressCheckoutPaymentResponseDetails></DoExpressCheckoutPaymentResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>