If I complete my app and I used a module front the marketplace that cost money do I have to pay for the module every month thereafter that I update my code and re-publish?
Depends on the module.
There are those with a 1 time, per seat license. You buy it, build with it forever.
Then there are those with a per month fee. Those you have to have an active subscription at build time for.
Once published the Module will work for lifetime. Whenever you need the Module again (Update) you will be charged again if your subscription expired. Thats what I know so far.
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