Hi @Aberminirfc thanks for flagging this.
I believe that once you mark the order as completed/picked up it's listed as a completed transaction and therefore cannot be reverted unless you refund it.
In this case, you may need to ask the customer to process the transaction again and refund the original - or just keep a manual record of this one until it is collected.
Apologies that I can't help more with this - let me know if you have any questions.
Breffni
Community Moderator, Ireland, Square
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