Recording orders shipped and paid in Shopify

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Our website is set up as you must have an account to place an order and we locally deliver. We make a packing slip in quickbooks and then deliver on a certain day of the week. After we deliver we invoice the customer who for the most part are all on Net 30. When the customer sends in payment we record it is quickbooks. How do we have quickbooks tell Shopify that it was delivered and then paid ?