- specify the terms of trading ??
- important for/to- both could be possible; could you give a bit more context?
- finally/ in conclusion- both work
- on certain markets -in
- cooperation or collaboration- depends on the context and the degree of association
- In our clients the due is usually...days. - I don't get the meaning of this
- Of course, we are accessible (or we accept or we are opened???) if you specify a credit- what will you actual;ly do if they specify?
-Redo the invoice in which you confirm the mentioned due date.- mentioned or agreed?
-Open the topic- broach the topic
which we counted with??? (or we were aware about???)- aware of
Student or Learner