I have many customers and they install my webapp on their own domain.
How can i configure my app -> redirecturl and cors to use each of their domain?
Do I have to create one app for each of my client with a domain?
That is not possible and you certainly don't want a separate app for each customer. I would route them to your server which could then redirect to the appropriate domain. You won't be able to make API calls directly from the browser though (due to CORS), you will have to proxy them.
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