If I want to invoke a workflow using a client app what the endpoint I have to call and are there any samples available? I know in 2010 we can do it by calling _vti_bin/NintexWorkflow/Workflow.asmx
I think this is still in development for O365 : see uservoice on this NINTEX 365 API subject Nintex 365 APIs: Top (13 ideas) – Customer Feedback for Nintex
At the moment this is correct. The only workflow api we have is through the Workflow.asmx - non Nintex. But can you use CSOM instead of a REST api?
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