DoDirectPayment IPN Verification - php

Is there a way to verify the IPN we get from Paypal for DoDirectPayment, credit card payments?
The notification validation mentioned on the page https://www.paypal.com/en/cgi-bin/webscr?cmd=p/acc/ipn-info-outside seems does not work with DoDirectPayments and returns "INVALID" with correct data too.
Is there something similar available for Paypal Payments Pro? I tried searching the web but could not find something helpful.
Thanks in advance :)

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Following paypal documentation
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The information you are looking for can likely be found in this document

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I have no experience in integrating Paypal, so I'm sorry if my questions seems a little bit odd..
I have tried for the last 48 hours to read Paypal API docs, but I can't figure out how to achieve what I'm looking for:
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Problems validating credit card using Paypals PayFlow API

I hope someone can help with this problem I'm having.
I am building a shopping cart solution using the PayPal payflow api. I have been able to submit successful transactions but. I am having problems with AVS checks and validation.
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The response codes for AVS and CVV2 come from the card issuing bank, so if you're absolutely certain you're entering the correct value and it's still coming back with an N then you need to call the card issuing bank and as them why that would be happening.
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I am working on a website where the payment system needs to be changed from paypal standard to paypal payment advanced. The transaction type for the website is almost always a 'Authorization'. So, we capture payment later when we ship the item.
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I am new to sandbox and paypal payment gateway. I am using paypal adaptive payment to pay amount to two people at a time. My current code works perfectly. I am using the paypal generated code. I just want to know that is it possible that when the payment is made successfully can I make that entry to my database. I have my php code, but where do I need to write this?
Thanks in advance(plzz no down votes)
You should wait for the IPN message that contain details about the payment status
https://www.paypal.com/ipn
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