发催款函，英语可选用：
Reminder of Payment（付款提醒函）
Notice of Delinquent Payment（欠款通知）
Notice of Overdue Payment（付款逾期通知）
例：
This is a reminder that your account balance of $<欠款额> was overdue as of <到期日期>. Enclosed is a statement of account foryour reference.
Please arrange payment of this account today or, if you cannot make full payment at this time, please contact us to make a payment arrangement that is mutually acceptable.
Your prompt attention to this matter would be greatly appreciated. If youhave any queries regarding this account, please contact our office as soon aspossible.
If payment has recently been made, pleaseaccept our thanks and ignore this reminder.
与国外客户生意往来常会出现拖欠款项的情况。如果有相关合同条款，按合同条款办。如果没有，催款通行的做法是发30天、60天和90天的催款信。如果数额巨大，120天后可通过律师发律师信或追款公司追讨所欠款项。
外贸如何催客户下单话术
礼貌的催客服付款的话术推荐如下：
1、亲亲，看到您拍下包包还没付款，是遇到什么问题或者犹豫吗？有什么问题和犹豫可以和我说哦，非常愿意为您效劳呦！
2、亲爱的，忙完了吗？把咱们拍下的宝贝付款了呗，俺等您半天呢，小礼品已经给您备注好了，您一付款仓库好尽快帮您安排哈！
3、您好，下午3点前付款的订单，可享有优选发货特权，付款后订单即可进入发货流程，当天发货完成，而且订单在交易成功后可截图此消息与在线客服兑换五元优惠券哦。
4、您好，这边是XXX店铺的客服，看到您在我们店铺拍下一个订单还未付款，请问是在付款有碰到什么问题吗？（根据买家回复情况在回答）
5、迷人的美女妈妈您好，您之前为宝宝看的那双鞋子满意吗？满意的话抓紧给宝宝领回家哟。祝宝宝快高长大，越长越可爱，棒棒哒！
6、专柜的鞋子千千万，只有新的，合适宝宝的，那才是最好的哟。一双漂亮的鞋子可以带给宝宝愉快的心情哟，宝宝省心，妈妈安心，这样您的心情也会跟着好哟！
7、亲，看到您在我们店拍下了商品，现在跟您核对下收货地址哦。
8、亲，我们是下午5点发货哦，晚了可能就要拖到明天发货了哦。
9、您好，看到您这边没有支付，我们这边是7天无理由退换的，还帮您购买了运费险，收到以后包您满意，如果不满意也没有后顾之忧。
10、您好，您在XX店铺拍下的商品还没有付款，因为您是第一次（老客户）**本店的商品，我给店长申请了这次给您VIP价格，比您拍的时候少了很多哦。
Dear Brett,
How are you? It it a little long time no
contact.Today is the beginning of August.Wish good
luck to you and your family, your business.As some of our customers want to catch thel
chances to sell good before Christmas.
To help and meet their request..We will do the
promotion.If you buy goods from us in these two
month..We will have discounts.$20 reduce if you buy 10 cartons of toys from
us..You can save $300 at most..
Attachment is something related
Christmas..Kindly check if you like anything..Aslo we will have
the discounts if you want to repeat any orders from our factory
-XXX.We noted some of our goods appear in your
website.Can you please kindly tell me if any flaw of our toys?We promise to replace or refund in the
next order..
Wait for your kind reply..Good luck XXX.
催单虽不易，且催且珍惜，不要过度频繁地催单，会导致客户厌烦，而且你催单来来去去就那几句。还不如多练练写开发信呢。如果客户暂时对你的产品不感兴趣，最好就是一个月一封，希望对大家有帮助~