PhotoDay accommodates combined checkouts, as long as the customer is ordering from the same job.
This is especially helpful when using PhotoDay's Private Galleries, as customers can add packages and products to their cart for one private access code, then visit another private access code from the same job, add more packages and products to their cart, and check out only once, resulting in only one shipping charge.
The customer will need to shop one order at a time. This customer-facing article walks them through every step, so feel free to check it out yourself and share it with your customers!
Customers can access the first subject's gallery, pick their favorite photos, and select their products like normal.
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But before they click "Proceed to checkout," a pop-up will display asking if they have other private galleries from the job that they would like to shop for. If they have previously accessed another gallery from the same job, or another gallery is associated with their email address, the subject name will automatically populate for them:
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In this second gallery, they can repeat the shopping process, and when they're ready to place their order, they will see a combined cart from both galleries!
Then complete the checkout process as usual, and the photos will be on their way!
It is not currently possible to combine checkouts from entirely different jobs (like separate group/public galleries).