How does Refund actually work?

Hello,

I needed some information on what actions nopCommerce takes when you refund a payment.

For example, will it transmit the information to the banks or paypal and return the money to the customer?

- Credit Cards
- Checks / Money Order
- Paypal

The refund only creates a record in the store database that store owner gave a refund to the customer. The store owner actually have to manually do the transaction to make the refund (depends on what payment method store is using).

To see if any payment method supports refund or not: Go to Admin section > Configuration > Payment > Payment Methods

Click on any payment method "EDIT"

On the "Edit payment method" page you will see these options

Supports refund: No/Yes
Supports partial refund: No/Yes

|I want a sample about implementation of refund.can u help me?

See documentation.  For example:

https://docs.nopcommerce.com/user-guide/running/order-management/return-requests/index.html