关于尼日利亚的付款方式 求助急急急

大家好，最近谈了尼日利亚的客户，样品寄了（客户付的邮费），价格也确认了，pi 也了，但是客户坚持信用证， 老板不同意信用证，我该如何说服客户接受tt付款呢，下面是客户给的最后一封邮件，谢谢大家帮忙！ hello m, we quite understand your concern but try and understand the fact that we are dealing with you first time not knowing you or been to your country. the bank we use has one of the largest investment in new york united state of america; the bank is united bank of africa (uba). you can find out about this bank through your embassy in nigeria or google the bank. this is not a bank that can die or bankrupt.. please, do your investigation of this bank and revert back to us asap; we plan to do genuine and honest business that will last a long term with you not just one off time business. we are looking towards a business that will invite??you down to our company in nigeria and we shall also visit china later. trusting you that you do a thorough job. thanks.