PayPal IPN message not delivering v1.9.3.6 – Order status not updating

I am trying to get the back and forth with PayPal working. I am using PayPal Website Payments Standard and it is configured like: PayPal Config

When I place an order it gets processed correctly, the transaction appears in PayPal and the payment gets debited from my account and deposited to the company account.

On PayPal I have configured IPN to be Enabled and the Notification URL is https://www.my-site.com/paypal/ipn/ I have also tried to set this to https://www.my-site.com/paypal/ipn/index/ but both IPN status are constantly Retrying.

An example IPN message is:

mc_gross=0.20&invoice=100000073&protection_eligibility=Eligible&address_status=confirmed&item_number1=1&payer_id=UDRGS3QP5FEEW&tax=0.00&address_street=13 Old Drive&payment_date=12:19:26 Jul 24, 2019 PDT&payment_status=Completed&charset=windows-1252&address_zip=BT66 6JS&first_name=Peter&mc_fee=0.20&address_country_code=GB&address_name=Peter Bear&notify_version=3.9&custom=&payer_status=verified&business=info@my-site.com&address_country=United Kingdom&num_cart_items=1&address_city=Belfast&verify_sign=AVKF91NKB8nqPQ86vcDt9PrSFBcfArsuGma.Sr8yXCBvd5zYcqyYCBzv&payer_email=my-email@hotmail.com&txn_id=5CV84837FR063293F&payment_type=instant&last_name=Bear&address_state=Antrim&item_name1=Cheap Test&receiver_email=info@my-site.com&payment_fee=&shipping_discount=0.00&quantity1=1&insurance_amount=0.00&receiver_id=MEAUFW4MCPDPG&txn_type=cart&discount=0.00&mc_gross_1=0.20&mc_currency=GBP&residence_country=GB&shipping_method=Default&transaction_subject=&payment_gross=&ipn_track_id=b71b6a024227d

Checking the payment_paypal_standard.log it contains:

2019-07-24T19:18:55+00:00 DEBUG (7): Array (     [request] => Array         (             [business] => ****             [invoice] => 100000073             [currency_code] => GBP             [paymentaction] => sale             [return] => https://www.my-site.com/paypal/standard/success/             [cancel_return] => https://www.my-site.com/paypal/standard/cancel/             [notify_url] => https://www.my-site.com/paypal/ipn/             [bn] => Magento_Cart_Community             [item_name] => My Site             [lc] => en_GB             [charset] => utf-8             [amount] => 0.20             [tax] => 0.00             [shipping] => 0.00             [discount_amount] => 0.00             [item_number_1] => 1             [item_name_1] => Cheap Test             [quantity_1] => 1             [amount_1] => 0.20             [cmd] => _cart             [upload] => 1             [tax_cart] => 0.00             [discount_amount_cart] => 0.00             [city] => Belfast             [country] => GB             [email] => my-email@hotmail.com             [first_name] => Peter             [last_name] => Bear             [zip] => BT9 7BT             [state] => Antrim             [address1] => 13 Old Drive             [address2] =>              [address_override] => 1         )      [__pid] => 4685 ) 

The only entry in system.log is below, but I don’t know it’s relevance:

2019-07-24T19:59:31+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): Entity: line 9: parser error : Opening and ending tag mismatch: hr line 7 and body  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:31+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): </body></html>  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:31+00:00 ERR (3): Warning: SimpleXMLElement::__construct():        ^  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:31+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): Entity: line 9: parser error : Opening and ending tag mismatch: body line 4 and html  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:31+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): Entity: line 9: parser error : Premature end of data in tag html line 2  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:51+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : Space required after the Public Identifier  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:51+00:00 ERR (3): Warning: SimpleXMLElement::__construct(): <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 2019-07-24T19:59:51+00:00 ERR (3): Warning: SimpleXMLElement::__construct():                                                  ^  in /home/admin/my-site.com/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173 

All of this means that the order status sits at Pending Payment and I only have an option to change it to Processing manually. This does not kick in the email workflow and so no emails are sent to let us know a new order has occurred.

Is there anything that I have missed? I am not a Magento developer, I deal with .Net, but this was made for us by a local company that is not available anymore and there isn’t really the money to get someone else to look at it.