As a customer, I can ask for or request a refund. Depending on the situation, it could be a full (all of what I paid) or partial (only part of what I paid is given back) refund. As a customer, I hope for a prompt refund.
The seller can give me a refund or issue a refund. Sometimes, the seller will deny a refund because it is against their policy.
I hope this helps but I'm not sure it's exactly what you meant.