The already paid package is used when you made a photoshooting with your customer and included some free (digital) pictures in the price for the photoshooting.
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It is important to remember that the already paid package can only used ONCE per gallery! So it would make sense to use this function for a photoshooting with a single customer and not for a wedding shooting for example.
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To activate this function you need to go to the overview of your gallery and click on "Shop":
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Here you need to activate the digital shop. Then you can already select an already paid package from your digital pricing list:
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