def generate(tax_id, nat_id, verification_code, amount, filename):
amount = str(int(amount)) + '00'
writer = ImageWriter()
writer.hello = types.MethodType(paint_text, writer)
writer.register_callback('paint_text', writer.hello)
barcode_str = ('|' + tax_id + '\x0d' + nat_id + '\x0d' +
verification_code + '\x0d' + amount)
c = barcode.get('code128', barcode_str, writer)
c.save(filename)
