Is it mandatory to send order with an invoice in it?

Is it mandatory to send order with an invoice in it? Sending goods from the Netherlands here. Plants, tea, ethno botanicals and others. I would like to know if I have to join a paper invoice along my customer's order in the box I'm sending (throughout Europe). The customer already receives a digital invoice on his e-mail after completion of payment. Myself when I order stuff, there's almost all th...

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