spree-contrib/spree_print_invoice

pdf.repeat(:all) do
  pdf.grid([7,0], [7,4]).bounding_box do

    data  = []
    data << [pdf.make_cell(content: Spree.t(:vat, scope: :print_invoice), colspan: 2, align: :center)]
    data << [pdf.make_cell(content: '', colspan: 2)]
    data << [pdf.make_cell(content: Spree::PrintInvoice::Config[:footer_left],  align: :left),
    pdf.make_cell(content: Spree::PrintInvoice::Config[:footer_right], align: :right)]

    pdf.table(data, position: :center, column_widths: [pdf.bounds.width / 2, pdf.bounds.width / 2]) do
      row(0..2).style borders: []
    end
  end
end