All screenshots in the article were taken in the Dutch version of Yuki.
The Credit card payment action is used for the credit card statement payments. This action posts the bank transaction to ledger account '23000 Internal transfer of funds'. The entries on this ledger account must be balanced, if they don't then you are still missing a credit card statement or bank transaction.
To start processing bank transactions, open the domain and then click on the Bank icon.
In the Bank transactions to be processed workflow, click on > in front of a bank transaction line.
You will see the following screen when you click this action::
You click on the Save button which opens the screen where you can potentially match the credit card payment with an invoice. You can then click on the Completed button, which will show the next transaction in the workflow.