If my return gets validated, how and when will I get my refund?

I cannot see my refund but got an email with the subject "Jumia Refund"?

What is a refund voucher?

How do I use my voucher?

If my returned product is not validated for refund, how do I get informed?

I have bought an item on promotion or with a voucher. What amount will you refund me?

How long would it take to get my refund?

Do I also get refunded the delivery fees when returning a product?