API Guidance On Which One To Use and Etc...

[DevSurp2018]

I have multiple areas I sell in and have used PP for most transactions. I would like to get all the order details using the API. I will be using SOAP like Coding (VBA/HTTP). I Do not need any other situation right now but to collect order details from PP.  Would I use "GetTransactionDetails"?

I keep getting Error 404 whenever I send this XML:

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Header>
  <RequesterCredentials xmlns="urn:ebay:api:PayPalAPI" xsi:type="ebl:CustomSecurityHeaderType">
  <Credentials xmlns="urn:ebay:apis:eBLBaseComponents" xsi:type="ebl:UserIdPasswordType">
    <Username>UsernameValue</Username>
    <Password>PasswordValue</Password>
    <Signature>SignatureValue</Signature>
    <Subject xsi:type="xs:string"/>
  </Credentials>
  </RequesterCredentials>
</SOAP-ENV:Header>
<SOAP-ENV:Body>
<GetTransactionDetailsReq xmlns="urn:ebay:api:PayPalAPI">
<GetTransactionDetailsRequest>
<Version xmlns="urn:ebay:apis:eBLBaseComponents">204.0</Version>
<TransactionID xs:type="xs:string">TransactionID</TransactionID>
</GetTransactionDetailsRequest>
</GetTransactionDetailsReq>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

I am making the request to "https://api-3t.paypal.com/2.0/"

Thanks for the help.