Paypal Sandbox ExpressCheckout NVP not creating transaction

Question

I'm trying to integrate PayPal Classic API NVP to our website but I'm having issues with the SetExpressCheckout API call.

I'm using the useraction=commit parameter for the payer to confirm the sale directly at PayPal.

My issue is after "Pay now" is clicked, PayPal redirects to the URL I send as RETURNURL but I don't see the transaction on the sandbox account or by using TransactionSearch.

These are the parameters I send for checkout:

METHOD=SetExpressCheckout
EMAIL=payerEmail
SOLUTIONTYPE=Sole
RETURNURL=myReturnUrl
CANCELURL=myCancelUrl
PAYMENTREQUEST_0_AMT=30.00
PAYMENTREQUEST_0_ITEMAMT=30.00
PAYMENTREQUEST_0_CURRENCYCODE=USD
PAYMENTREQUEST_0_CUSTOM=myCustomId
PAYMENTREQUEST_0_PAYMENTACTION=Sale
L_PAYMENTREQUEST_0_QTY0=1
L_PAYMENTREQUEST_0_AMT0=30.00
L_PAYMENTREQUEST_0_NAME0=myProduct

After payment, PayPal redirects to

myReturnUrl?token={Token}&PayerID={PayerId}

Answer 1

It's normal. The transaction is set, but you need to complete it using the DoExpressCheckoutPayment api operation.

More information and an example here: https://devtools-paypal.com/guide/expresscheckout/dotnet?success=true&token=EC-7BD474648D4932937&PayerID=WNW7LMW2UXQJG