How to setup a Deposit and Refund system on empty Beer Kegs

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I hope you can help me please - We are selling 6L beer kegs which the customer has paid a €5 deposit per keg. When the customer is finished their beer, we are encouraging them to log a return of their empties, We will pay the collection & send return labels with their purchase - So it's hassle free on the customer & once we receive their empties they will get €5 credit to their account, but i can't see how this would work in our shopify store, am i missing something !!!

Thank you in advance