Please pay promptly.

请及时祈付。

youdao

We should be obliged if you would let us know whether the said company is reliable in repaying debts, and also if they pay promptly.

如果你们能告诉我们这家公司在偿付债务是否可靠及他们付款是否及时，我们将很感激。

youdao

We are ready to extend to those who may find cash payment inconvenient. However, those who are willing to pay promptly may benefit by liberal cash discount.

——我方已准备给与不便以现金付款者信用贷款，然而，凡是愿意即时付款者得以享受大幅的现金折扣。

youdao

The Paris Club this week sent a cross letter, saying that Russia must pay, promptly and in full.

ECONOMIST: Russian debt: Promises, promises | The

Lesley Kemp, 55, took to Twitter claiming that a company based in the Middle East had failed to pay her promptly for transcription work.

BBC: Lesley Kemp faces libel suit over Twitter comments

Your credit record will reveal how promptly you pay bills and cards.

BBC: A guide to money for young people