Transactions are by no means cancelled, and there’s no refund. Nevertheless, the sender additionally doesn’t want to attend for something to occur earlier than making an attempt to make use of their cash in one other method, a minimum of in idea.
When a consumer broadcasts a transaction, it expresses an try to maneuver the cash concerned. As soon as that transaction confirms, everybody will agree that that occurred. However earlier than affirmation, it’s a matter of perspective. Sometimes, the sender’s pockets will deal with the cash as gone as quickly because the transaction is created, however so far as the blockchain is anxious, they nonetheless reside within the sender’s pockets.
The protocol doesn’t stop the sender from creating one other transaction that spends the identical cash, which subsequently essentially conflicts with the primary one (via a precept referred to as Change-By-Charge (RBF)). Some wallets enable RBF only for the aim of accelerating the payment of a transaction that’s occurring too sluggish, however some additionally enable a consumer to “abandon” a non-confirming transactions in some circumstances, allowing the funds to be spent in one other manner.
In brief, there may be nothing to refund, as a result of so far as the community is anxious, a non-confirmed transaction merely hasn’t occurred. It’s a matter for the sender’s pockets the way to take care of that.