I am integrating paypal payment gateway in my website. I have a sandbox account. I have set IPN url in my website. Now i am checking IPN response in IPN Simulator. But it's showing "IPN was not sent, and the handshake was not verified. Review your information." message. I have a AWS server. can you please tell me which port it uses for response. So i can enable it on my server. My server is enabled for all URL's. I also don't have firewall protection enabled on my server. Please help! I am working on it from last 5 days
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