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Hi @miguelonx,
If you have a license for Dokan Pro, my recommendation is to use the built-in EU Compliance Fields module to manage individual PDF invoice numbers for vendors.
If you’re using the free version of Dokan, we can provide you with a code snippet to achieve the same, if you have a valid license for either Premium Templates or the Professional extension. However, please contact us by [email protected], since WordPress.org doesn’t allow us to answer pre-sale question or provide premium support for paid plugin in these forums.