You can simply find all types of cashback from your 'My Cashback' in your Fave app following the steps below:
Step 1: Open the Fave app
Step 2: Click on the Me tab
Step 3: Click on My Cashback to view your cashback page
Step 4: Tap on the respective cashback to see the details breakdown and your cashback expiry date. 
Note: eCard Cashback can be traced under the Partner Cashback section as well.