Draft Order Checkout Add Items From Shop

New Member
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Good morning. I hope this is the correct place to post this question. I send my customers draft orders from social media claims. They are used to being able to go into my store and add on to their invoice (the old platform I used) and pay everything all at once. (EX: They receive their draft order, click on the Visit Store link in the invoice as opposed to checkout, add items to their cart and checkout with the invoice and any added items) I would like them to still be able to do this! Is this a possibility somehow?