After a client pays, that money will be transferred into your bank through an Outbound Transfer or Deposit. You can learn more about how Outbound Transfers work here (Article).

If you ever need to know which transfer a payment was included in, you can:

First, head to the Billing tab of the Project. From here, check to see if any payments have the "Settled" check mark.

If the payment has been Settled, it's been transferred to your bank!