If you had placed an order on the RedMart website or app with a delivery date of 2 to 22 March 2019, the rebates you earned on those orders will be available on Lazada by 31 March 2019.
For orders delivered before 2 March, your LiveUp credits would be in your Lazada account. Go to My Account > LiveUp, where you can see your LiveUp credits across both RedMart and Lazada.
When placing an order, your LiveUp credits will be automatically applied. You will be able to see the rebates being applied at the last page of check-out when you are choosing your payment method.