If you are selling a system the best way (not to do this exactly) is the signals service here . The system is setup you just plug your signal account to it and sell it .
Aside from that the hard solution is getting access to the backend of the broker(s)
But , If you are referring to one strategy that you or someone has ,then you will need to bridge your servers to your clients terminals via an ea utility .
However this will allow controlling that strategy alone not the entire account and your clients will need to keep their terminals up 24/5 .

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Hello
I wan to create a web application such as a website where you login with user name and password. Then you input your MT5/4 user name and password as well as your server and then be able to control the following:
Max risk
Max position
Max lot allowed in the account
Profit taking
What is the best way to do this? Will i need API integration ( I assume i do but there is no API i can access directly)
Please help
Thanks