DEM 
Events:

LS-Label generated: Triggered when a shipping label is generated.
LS-Shipped: Triggered when a package is in transit with the carrier.
LS-Delivered: Triggered when a package is successfully delivered.
LS-Out for delivery: Triggered when a package is out for delivery and expected to be delivered soon.
LS-Failed delivery: Triggered when a delivery attempt was unsuccessful.
LS-Delayed in transit: Triggered when a package is experiencing delays during transit.
LS-Unused labels: Triggered when a generated shipping label remains unused.
LS-Delayed delivery: Triggered when a package's delivery is delayed beyond the estimated timeframe.
LS-Lost/Damaged: Triggered when a package is lost or damaged during transit.
LS-Returned: Triggered when a package is returned to the sender.
LS-Predicted delays: Triggered when LateShipment predicts potential delays in the shipping process.
LS-Suspectedlost: Triggered when LateShipment suspects a package may be lost.
LS-Customer feedback - Post delivery: Triggered to gather customer feedback after a delivery is completed.

Merge tags:

                      "[[event.trackingnumber]]"
                      "[[event.shipdate]]”
                      "[[event.estimateddate]]"
                      "[[event.ordernumber]]"
                      "[[event.Customername]]"
                      "[[event.lsstatus]]”
                      "[[event.carrierstatus]]"
                      "[[event.trackinglink]]"
                      "[[event.carriertype]]",                   
                       "[[event.servicetype]]"    
                           "[[event.shippingname]]"
                           "[[event.shippingstreet]]”
                           "[[event.shippingstreet1]]”
                           "[[event.shippingcity]]"
                           "[[event.shippingstate]]”
                           "[[event.shippingzip]]”
                           "[[event.shippingcountry]]”
                           "[[event.billingname]]”
                           "[[event.billingstreet]]"
                           "[[event.billingstreet1]]"
                           "[[event.billingcity]]”
                           "[[event.billingstate]]”
                           "[[event.billingzip]]”
                           "[[event.billingcountry]]”

Returns
Events:

Return Initiated (with shipping label) - When a return is approved and initiated
Return Initiated (without shipping label) - When a return is approved and when a return is initiated
Return In-Transit With Delay - When a return is delayed in transit
Return Received - Returned item received at the warehouse
Return Approved - Return request reported has been approved
Return Rejected - Return request reported has been denied

Merge Tags:

                '[[event.customer_name]]' 
                '[[event.return_id]]'
                '[[event.order_no]]’ 
                '[[event.tracking_link]]'
                '[[event.product_name]]' 
                '{{event.product_details}}' 
                '[[event.tracking_number]]'
        '[[event.link_to_shipping_label]]'
'[[event.address]]'
'[[event.product_status]]'