My issue is that PayPal is performing security checks on their end, but marking the order as pending. This means that I am getting an OK status from the notification response on SagePay, but am unable to hold the order from being sent to the warehouse which the client has requested.
The documentation I have taken a look at is https://www.sagepay.co.uk/file/25046/download-document/SERVER_Integration_and_Protocol_Guidelines_270815.pdf and I have attempted to speak with SagePay directly.
Please, could someone let me know whether they have ever integrated the PayPal IPN with the SagePay server integration before?
Thank you