The free version has limits as described in this article. There are no limits with the paid/full version.
Just add the number of users under Team in the payment form.
Please read this article.
Yes, you can add additional users under your management. More information can be found here.
Yes, you can download a quote from the payment form.
Usually payments are registered instantly and you can use the full version of the add-on straight away. However, sometimes the payment provider's system might take a few minutes to inform us that you have paid.
No, it does not matter which email address you use with your payment provider. The payment is always connected with the Google account you loaded the add-on from or the email address you enter in the payment form.
Yes, each license is granted to one account only. However, if you would like to grant access to a number of users you are eligible for a volume discount. You can calculate your discount by filling out the payment form.