Is it possible to send email during start date and end date ,an Api call will be triggered during start date and it gets ends at end date . So when the start date arrives Api call be triggered during which i need email to be sent and vice versa ( when Api call ends at end date another email needs to be sent )
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Not sure if I'm reading this right, but have you looked at using an event trigger?
https://docs.appian.com/suite/help/23.1/Event_Triggers.html
To send emails you can just use the Send Email node in your process which is called via an API.
https://docs.appian.com/suite/help/23.1/Send_Email_Smart_Service.html