Shopify will be making changes to the certificate used to secure subdomains of myshopify.com (eg: https://test.myshopify.com/) effective February 13, 2023. The current certificate which is being used is issued by Cloudflare via DigiCert. We will be adding in additional certificates signed by Lets Encrypt and Google Trust Services.
Note: This will not affect the certificate used for mTLS connections.
For more information refer to the community notice.