Paypal SSL upgrade for IPN for website checkout

We have an ilance powered website that has checkout pages that utilise paypal IPN. Paypal have contacted us to let us know that as of 30th of this month an SSL certificate will need to be used on the site. We utilise checkouts on two different domains so the checkout pages will need updating in coding to use this. We have installed the SSL certificates so just need the coding updating. There may be further ongoing work after this as we have been let down by our usual coders. Below is what has been sent from paypal -------------- As we have previously communicated to you, PayPal is upgrading the certificate for [login to view URL] to SHA-256. This endpoint is also used by merchants using the Instant Payment Notification (IPN) product. This upgrade is scheduled for 30/9/2015; however, we may need to change this date on short notice to you to align to the industry security standard. You’re receiving this notification because you’ve been identified as a merchant who has used IPN endpoints within the past year. If you have not made the necessary changes, we urge you to do so right away to avoid a disruption of your service! Because these changes are technical in nature, we advise that you consult with your individuals responsible for your PayPal integration. They will be able to identify what, if any, changes are needed. Please share this email and the hyperlinks below with your technical contact for evaluation. Testing in the Sandbox is one of the best ways to make sure your integrations work. Sandbox endpoints have been upgraded to accept secure connections by the SHA-256 Certificates. Full technical details can be found in our Merchant Security System Upgrade Guide. In addition, our 2015-2016 SSL Certificate Change microsite contains a schedule of our service upgrade plan. Thanks for your patience as we continue to improve our services.