I'm not a teacher, but I think the same tense should be used in both parts of the sentence.
So I would say:
"The item offerer WAS a Chinese, and he only ACCEPTED payment through traditional Bank."
"The item offerer IS a Chinese, and he only ACCEPTS payment through traditional Bank."
Also, I think the best is to use the same tense all through the story, so either past or present.
Student or Learner