SSL Certificate is a type of digital certificate that provides authentication for a website.
Search Engine Optimization Simply referred as SEO
On-page SEO and Off Page SEO
On Page SEO Includes Keywords, Content, Tags, Description
Off Page SEO Includes backlinks
For Example, if we have a web site with name papermill.in.
On -page refers (Content in the page, using keywords in the content)
Off Page refers that actions taken outside of the website.
Hank here from Shopify.
As @charlesdavid mentioned, SSL is a certificate that helps secure your domain, enabling encryption, and protect information relating to your domain.
When it related to your payment gateway, they could be mentioning the payment method you used to purchase your domain or another reason. We would always advise of reaching out to your payment gateway for further information relating to any error message you receive.
Normally, SSL certificates are provisioned automatically once domain propagation initiates, but your domain provider can manually reprovision the certificates if there were any issues relating to the domain. That said, I would like to know a bit more about the issue you are referring to.
Can you tell me a bit more about the email you received, or if you query with EBS, let me know if you need more information from a Shopify standpoint.
All the best,