For some payment types some additional steps are needed. For example a received payment with check that needs to be filled in with the customer's check number.
In that case the payment method linked to the payment needs to be configured to require an "Automatic" Execution Type process.
All of the above implies an additional step to take in the Payment In window which is to execute the payment by using the process button "Execute Payment".
This process button is only shown in case of payment/s linked to an automation execution process for which the check-box "Deferred" is selected.
If the check-box "Deferred" is not selected the additional step is still required but it will be automatically executed without any end-user action.
The Execution History tab is a read-only tab which shows information about the execution of the payment such as the execution date, obviously once the payment has been executed.