Yes, you can invite other users to your account and decide to be either read-write or read-only permission.
You can define how frequency you need to check your website, there are many options, however available periods are available based on your current subscription.
When you define a web check monitoring, it monitors website loading and you can configure it to monitor SSL expiry
Yes, you can define multiple contacts and select the communication preference for each of them
Shopify currently has 3 methods available to send notifications:
Here are the differences between each plan:
With Scheduled reports, you can receive a PDF document with your service uptime and outages. they can be scheduled daily, weekly, and monthly, and you can specify what services to receive reports for.