Adding custom fields to Plugin

  • I am currently using WP-Invoice plugin which does everything I need.

    The only thing missing is the ability to enter a Purchase Order Number.

    I have asked in the support forum but got no reply and to ask the developers direct they want money before looking at anything even though a PO Number is a pretty standard field for an invoice.

    I was hoping someone could point me in the direction of how to add a custom field in the back end?

    I need to add a PO Number and have this appear on the PDF invoice but im not sure where to start.

    Any help would be great.

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