From the left navigation menu, tap Membership > Billing Manager.

Search for and tap on the account you would like to manage.

Search for and tap on the ledger item you wish to refund.

Tap + Create a Refund.

Choose whether you would like to process a full or partial refund. If partial, choose the applied charge and enter the refund amount.
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Select if you would like to refund the electronic processing fee, if applicable, or skip electronic processing.

If you want to issue a full refund credit, tap the checkbox to do so and choose the proper charge category from the drop-down.

Tap Process Refund.