Paypal integration - GetExpressCheckoutDetails PaymentActionNotInitiated

Question

I am working to implement a Paypal Express Checkout. I have setup a Paypal developer and sandbox account including a Personal Sandbox test account to act as the buyer. I am implementing a SOAP solution and so far have been able to complete the following steps

1. Submit SetExpressCheckout request
2. Use token from SetExpressCheckout response to redirect user to Paypal payment page
3. Login to Paypal test using the Personal Sandbox test account. Once logged in I am taken to a 'Review your information' page. when I select 'Continue' on this page I end up back on the page I submitted as the Return URL.
4. From the Return URL page I submit a GetExpressCheckoutDetails request. On the response the CheckoutStatus always has a value of PaymentActionNotInitiated.

I have tried several sandbox accounts (verified and not verified) and the results are always the same. What would be causing this.

Sample of the SetExpressCheckout request is below

<soapenv:Envelope>
<soapenv:Header>
<urn:RequesterCredentials>
   <urn1:Credentials>
      <urn1:Username>sandbox_username</urn1:Username>
      <urn1:Password>sandbox_passwword</urn1:Password>
      <urn1:Signature>sandbox_signature</urn1:Signature> 
   </urn1:Credentials>
</urn:RequesterCredentials>
</soapenv:Header>
<soapenv:Body>
  <urn:SetExpressCheckoutReq>
    <urn:SetExpressCheckoutRequest
      <urn1:DetailLevel>ReturnAll</urn1:DetailLevel>
      <urn1:ErrorLanguage>en_US</urn1:ErrorLanguage>
      <urn1:Version>119.0</urn1:Version>
      <urn1:SetExpressCheckoutRequestDetails>
        <urn1:OrderTotal currencyID="EUR">13.08</urn1:OrderTotal>
        <urn1:ReturnURL>https://url/paypalreturnurl.htm</urn1:ReturnURL>
        <urn1:CancelURL>https://url/paypalcancelurl.htm</urn1:CancelURL>
        <urn1:OrderDescription>Invoice Num 31650</urn1:OrderDescription>
        <urn1:InvoiceID>31650</urn1:InvoiceID>
        <urn1:PaymentAction>Sale</urn1:PaymentAction>
     </urn1:SetExpressCheckoutRequestDetails>
   </urn:SetExpressCheckoutRequest>
  </urn:SetExpressCheckoutReq>
</soapenv:Body>
</soapenv:Envelope>

Answer 1

You will need to complete Doexpresscheckout to complete the payment. After payment is complete you will get CHECKOUTSTATUS=PaymentActionCompleted