Magento 2 Custom Order Number by Cynoinfotech
https://www.cynoinfotech.com/product/custom-order-number-magento-2-extension/
The Magento 2 Custom Order Number extension allows store admins to change the number range of store documents such as purchase orders, invoices, shipments, credit memos by setting prefixes and postfixes. Magento 2 Custom Order Number allows customizing order, invoice, shipment and credit memo numbers with any letters, prefixes, suffixes, variables as per business requirements.
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