I'm looking for a way to create and manage 1 million bitcoin addresses for 1 million of our users, any method is limitless and scalable. Open source methods and no full node load are preferred. Also there are any APIs that are not limited.
Any advise or guidance would be greatly appreciated..!!
Creating 1 million addresses should be simple/straight forward as long as you use a truly random input for generating private keys. But what do you mean by "manage".
Also note: when you yourself generate the addresses you also own the private key, this is not a preferred solution!
Yes, create BTC address for user deposit, receive notifications when there is a transaction to any address in it, then we can transfer the balance in all the addresses to other address.