For the payment conditions, T/T (telegraphic transfer) of payment will be done at the end of the month for each P/O (purchase order) issued for that month.
他に役立つ言葉：
money transfer: 送金
international trade: 国際貿易
transaction: 取引
LC letter of credit: 信用状
Sales: 営業
Mail Transfer: 普通送金
Demand Draft (D/D): 送金小切手
Negotiation: 交渉
Shipment document: 出荷書類
In payment terms, payment will be done at the end of each month by T/T(telegraphic transfer) for P/O issued.
ご質問ありがとうございます。
"支払条件で、「P/O発行月の月末T/T」"には：
「In payment terms, payment will be done at the end of each month by T/T(telegraphic transfer) for P/O(purchase order) issued.」とい言い方が使えますね。
In payment terms=支払い条件で（for/about payment terms)
[regarding payment terms]も使えます、「支払条件について」という意味です。
関連する他の言葉は：
Bill of lading(B/L)=船荷証券
Shipment=出荷
日本 
トルコ 
