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Menaka RaghuvanshiMenaka Raghuvanshi 

Apex class code to call an installed package

I want to develop an apex class to call the webmerge package (an app installed from App exchange). We will call this class into the java script button so that the button can have 2 functionality. Found couple of articles but somehow couldn't figure it out yet. Here are articles which I referenced. Can anyone help

http://salesforce-atom.blogspot.in/2014/01/invoke-apex-code-on-custom-button-click.html
http://blog.shivanathd.com/2014/07/call-apex-class-from-custom-button-salesforce.html
https://help.salesforce.com/apex/HTViewSolution?id=000175926&language=en_US
https://webmerge.zendesk.com/entries/66265965-Merge-Mappings-From-Custom-Programming