https://woocommerce.com/products/sequential-order-numbers-pro/
Generate sequential order numbers for your shopStart the order numbering at any number (or for shops with existing order numbers, any number greater than your current largest order number)Set a custom order number prefixSet a custom order number suffixInclude the current day, month, or year in your custom order number prefix or suffixInclude the current time: hour, minute, second in your custom order number prefix or suffixOrder number length can be set automatically by adding as many zeroes to the beginning of the order number as neededOrders with only free products can be excluded from the paid order sequence for accounting purposes, and assigned their own custom prefix
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