A. Yes, it will suspend them. We caution to be careful if you have more than 1 tier, or an admin payment because the person gets logged out when only 1 of their possible many subscriptions is canceled.
A. Solid Trust Pay is supported when using the direct payment commission tracking option. However, Solid Trust Pay is difficult to setup with subscription payments, plus has limited tracking, so we only recommend using them for 1x payments.
A. A member cannot belong to more than 1 membership. Instead, you can setup so each membership has different content.
Then make the membership that the member upgrades to include all the content from the member's original membership.
You can do this by setting up content groups and attaching them to content.
A. Yes. There are 2 ways to do it. You can either have it as an upgrade in the members area after they have already joined OR you can have it as a separate option that they initially signup for.
Getting the Membership IDFirst, either way you do it, you will need to get the membership ID of the membership you are adding as an option. To do this, when logged in as the admin go to the "Memberships" link. Click the link to edit the membership you are adding. At the top of the browser in the url bar you will see the ID at the end of the url. For example, if the url is /admin/membership/3, then your id is 3.
Adding an Upgrade OptionTo add an upgrade option in the members area you will need to create a link to Upgrade URL (You can copy it from edit billing page).
Adding a Purchase ButtonTo add a purchase button to any page outside the members area, you will need to make a link to the create an account page that has the id of the membership embeded in the link. For example, if the membership id is 3, then the link to your create.php page would look like: /join/~username~?membership=3