You can use TeamUp to record all the payments you receive in cash. First you will need to ensure that you have cash payments enabled in your payment methods page, which you can find in the payment section of your settings. Click options and then activate.
Note enabling cash payments will default to allowing all your customers to choose to pay by cash for all purchase types. You can control this by clicking the edit usability link in your payment settings (and override defaults for different customers).
With cash payments enabled, you will have the option to record a purchase as cash. For example a customer might give you cash for a class pack.
Once you added this payment it will appear in pending payments where you need to mark it as confirmed on receipt of the cash.
If you have any questions about managing cash payments with TeamUp please contact us at firstname.lastname@example.org.