Request for assistance with expired certificates in server-to-server notification payload from App Store

I am writing to seek your assistance in resolving a problem I am facing with the server-to-server notification payload from the App Store. I have noticed that the certificate verification is failing when I receive the server-to-server notification payload. Upon investigation, I discovered that the payload contains expired certificates. This is causing an issue for me as it is preventing me from verifying trusted notifications from the App Store. I would greatly appreciate your guidance on what I should do to address this problem. Is there any way to renew the certificates or any other solution to resolve this issue? Thank you for your attention and I am looking forward to your prompt reply.