A. Direct Payment - Add SolidTrust Pay button:
1- login to your solidtrust pay account
2- Go to my account -> view profile page

3- copy your username

3- Go to Merchant Zone -> Create Subscriptions

4- Click
MEMBERS - view the items you are subscribed to5- Copy your subscriotion Id

6- Paste both username and ID to your payment processors page

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

A. Commission is applied off of all payments received. Commissions are a percentage. So, if the trial is a free trial, then there is no commission. However, if the trial is a small amount (like $1 trial for 3 days), then the commission is applied as a percentage of the amount of the trial payment. So, in our $1 trial example, if the commission is 20%, then the commission amount from the trial would be $0.20.
