After you customer has installed their new stamp card you will want to update their card with the stamps already earned on their old card.

If the customer is present you can simply take a look at their stamp card and add the stamps immediately from the dashboard (or do it later)

If the customer is not present you can ask them to send a screenshot of their stamp card and then add the add the stamps when received.

Adding stamps from the dashboard

How to take a screenshot

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