The four step process for credit card transactions includes:
1) Authorization - the merchant requests authorization from the issuer via the acquirer and card network.
2) Batching - the merchant collects all authorized sales for the day and sends them as a batch to the acquirer.
3) Clearing - the batch is sent through the card network to the issuer who pays the acquirer after subtracting interchange fees.
4) Funding - the acquirer pays the merchant after subtracting its discount fee, and the cardholder is billed.