How to verify if VAT number is not empty before sneding invoice

  • Hello,

    I am using WooCommerce PDF Invoices & Packing Slips plugin for generating Invoices for the customers.

    I need to make a verification of the VAT number before sending the invoice. If the VAT number is empty I should return error message and should not send the invoice.

    Can you hlep me to implement this function in the plugin?

    Thank you in advance!

    Regards,
    Ivan

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