The following steps illustrate the basic flow of a PDT transaction. I am follow this url for PDT notification use - https://developer.paypal.com/docs/classic/products/payment-data-transfer/# "first and second step is working fine for me, but for third step I am not able to understand at which url of PayPal I need to send the transaction ID and my unique PDT token". Please help me. I am doing this for an Sandbox account.
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