Nothing happens. The license is not hosted on smartphones, in fact you can use all the smartphones you want, but they will only be able to access at the same time the number of devices that your plan has. For example if you have an event where several bands will participate, everyone can install the application on their smartphones, and present 6 at a time if you have a Stage plan, or 12 at a time if you have a Concert plan.

PayPal: You can use any credit card and also some debit cards.

Yes and no. Paypal requires that you associate a credit card to pay, but there are many web platforms that offer a “virtual” credit card in each country, you only need to load the money that you will use to pay and then associate the virtual card with your Paypal account. Find one that seems reliable in your country.

You can pay monthly plan or a full year. Of course the last option have an associated discount.

Yes, it is entirely possible. The price published for the total number of connections in the upper section will always be respected.