请帮忙翻译下面为英文，请手工，谢谢

Thank you for your checking. I still have a question about UPC to consult you. Since our products have no bar code, is it necessary to encode one by ourselves? If so, could you give us some examples?

Thank you for your checking, I still have a question to ask you, about the UPC, our products do not have this bar code. Is that we write your own one? If so, then you can provide some examples?

Thank you very much for your checking. But I still have a question to ask you that our product doesn't have a UPC bar code. Are we required to make up one by ourselves? If so,would you please give us some examples?