Decision Task approvals via Email

Can you explain little bit about how did you config the other actions via email ? via ETM ?

If you want to take decision it's the action type “MAKE DECISION”.

Thanks Rajana, one more question.

When taking the MAKE DECISON action, what are the “values” to provide for Approval vs. Rejected. Is it “Yes” and “No”, or is it “Approved” and “Rejected”, etc.?

It depends on the answer you set in the process designer. 
Whatever the value you set in the process designer should be used as “answer”.

Normally this type of functionality (when the approver send the email with his decision) process by ETM, which uses assystREST. So these are the values you should send with the REST call. 

<eventId>10295743</eventId>
        <decision>
            <answer>Yes</answer>
        </decision>
        <actionedById>62</actionedById>
        <actionedBy>test</actionedBy>
        <actioningServDeptId>68</actioningServDeptId>
        <serviceTime>
            <value>1</value>
        </serviceTime>
        <assignedServDept>
            <shortCode>SANAD-SD-SUPPORT</shortCode>
        </assignedServDept>
        <actionType>
            <shortCode>MAKE DECISION</shortCode>
        </actionType>
        <assignedServDeptId>68</assignedServDeptId>
        <actionTypeId>5000068</actionTypeId>
        <actioningServDept>
        </actioningServDept>