I have a requirement where before submitting the form (without clicking submit ), it should call the integration and validate the entered text , if incorrect data is present then throw validation on UI . Is it possible to call the integration with in interface?
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Yes, you can call your integration in a local variable using the rule! domain.
Is it possible for all integration methods like post,get ,put?
If the integration is configured to modify data, you can only call it inside a saveInto. This does not depend on the HTTP method.
what if i use start process service , what is the difference between this approach and start process (process model with startnode,integration and end node) ?
That difference depends on what you want to achieve. If you need to call multiple modify-data-integrations in a row, you need to use a process model.