How to call web service in native or on button click on a native page

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Can some one help me on this. I cannot find any web service call activity in nanoflow. but i need a rest call on Change event of a text box. From native page i cannot call a microflow  (as only can call a nanoflow from native page) so i cannot execute the rest service from there.  So how will i do this. For now i am thinking that i will call a afterStartUp microflow where i call  the rest service in a sub microflow of that and store all the data in application domain model. Will it create performance issue as whole project data will be called from service and store in the respective model Please guide me the proper way to call a service from native page button or any event in widget on native page?
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