Hi @Akkarin if you have time, can check on this. I think my problem is I use a personal paypal donation button instead of a business IPN.
<?php exit('Forbidden'); ?>
[2017-02-23 10:41:29] Received notification from 173.0.81.1 (notify.paypal.com)
[2017-02-23 10:41:29] Query string: cmd=_notify-validate&transaction_subject=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&txn_type=web_accept&payment_date=02%3A41%3A24+Feb+23%2C+2017+PST&last_name=Roque&residence_country=US&pending_reason=unilateral&item_name=Donation+Credits%3A+2+CREDIT%28s%29&payment_gross=2.00&mc_currency=USD&payment_type=instant&protection_eligibility=Ineligible&verify_sign=A07xhyyVgBF5FqBZ8JsE1yeuPIyTAYOn96STTuKzVC2KWz0-Yowgb-qk&payer_status=verified&payer_email=nikkoroque%40yahoo.com&txn_id=7HR74304TY090481M&quantity=0&receiver_email=donate%40fluidro.com&first_name=Nicholas&payer_id=684AM5NCKPP2S&item_number=&payment_status=Pending&mc_gross=2.00&custom=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&charset=windows-1252¬ify_version=3.8&ipn_track_id=65d9a0dbf1abc
[2017-02-23 10:41:29] Establishing connection to PayPal server at www.paypal.com/cgi-bin/webscr?cmd=_donations&business=ZWRYB8L8HJHCG&lc=US&item_name=Fluid%20Ragnarok%20Online¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted:80...
[2017-02-23 10:41:29] Failed to connect to PayPal server: [0] php_network_getaddresses: getaddrinfo failed: Name or service not known
[2017-02-23 10:41:29] Transaction invalid, aborting.
[2017-02-23 10:52:28] Received notification from 173.0.81.1 (notify.paypal.com)
[2017-02-23 10:52:28] Query string: cmd=_notify-validate&transaction_subject=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&txn_type=web_accept&payment_date=02%3A41%3A24+Feb+23%2C+2017+PST&last_name=Roque&residence_country=US&pending_reason=unilateral&item_name=Donation+Credits%3A+2+CREDIT%28s%29&payment_gross=2.00&mc_currency=USD&business=donate%40fluidro.com&payment_type=instant&protection_eligibility=Ineligible&verify_sign=AFcWxV21C7fd0v3bYYYRCpSSRl31ALhWeQw02TW9Q1Ig2X9yC2677wjQ&payer_status=verified&tax=0.00&payer_email=nikkoroque%40yahoo.com&txn_id=7HR74304TY090481M&quantity=0&receiver_email=donate%40fluidro.com&first_name=Nicholas&payer_id=684AM5NCKPP2S&receiver_id=ZWRYB8L8HJHCG&item_number=&handling_amount=0.00&payment_status=Pending&shipping=0.00&mc_gross=2.00&custom=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&charset=windows-1252¬ify_version=3.8&ipn_track_id=399c1cc8dfeba
[2017-02-23 10:52:28] Establishing connection to PayPal server at www.paypal.com/cgi-bin/webscr?cmd=_donations&business=ZWRYB8L8HJHCG&lc=US&item_name=Fluid%20Ragnarok%20Online¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted:80...
[2017-02-23 10:52:28] Failed to connect to PayPal server: [0] php_network_getaddresses: getaddrinfo failed: Name or service not known
[2017-02-23 10:52:28] Transaction invalid, aborting.
[2017-02-23 11:06:25] Received notification from 173.0.81.1 (notify.paypal.com)
[2017-02-23 11:06:25] Query string: cmd=_notify-validate&transaction_subject=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&payment_date=02%3A41%3A24+Feb+23%2C+2017+PST&txn_type=web_accept&last_name=Roque&residence_country=US&item_name=Donation+Credits%3A+2+CREDIT%28s%29&payment_gross=2.00&mc_currency=USD&payment_type=instant&protection_eligibility=Ineligible&verify_sign=AynlJ2zsmflH.74VEfIBZZJsEArxA-LZwvYxkM-0lZdOVCf-nH2FoZrB&payer_status=verified&tax=0.00&payer_email=nikkoroque%40yahoo.com&txn_id=7HR74304TY090481M&quantity=0&receiver_email=donate%40fluidro.com&first_name=Nicholas&payer_id=684AM5NCKPP2S&receiver_id=ZWRYB8L8HJHCG&item_number=&handling_amount=0.00&payment_status=Completed&payment_fee=0.36&mc_fee=0.36&shipping=0.00&mc_gross=2.00&custom=YToyOntzOjExOiJzZXJ2ZXJfbmFtZSI7czo2OiJGbHV4Uk8iO3M6MTA6ImFjY291bnRfaWQiO3M6NzoiMjAwMDAwMSI7fQ%3D%3D&charset=windows-1252¬ify_version=3.8&ipn_track_id=208c5400e0cc
[2017-02-23 11:06:25] Establishing connection to PayPal server at www.paypal.com/cgi-bin/webscr?cmd=_donations&business=ZWRYB8L8HJHCG&lc=US&item_name=Fluid%20Ragnarok%20Online¤cy_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted:80...
[2017-02-23 11:06:25] Failed to connect to PayPal server: [0] php_network_getaddresses: getaddrinfo failed: Name or service not known
[2017-02-23 11:06:25] Transaction invalid, aborting.