How to bring up the issue of prompt payment when your customer urgently needs your product or service

A customer calls and urgently needs you to provide your service. There's not enough time to highlight price and payment terms.

The customer is happy with the speed of your response, but later balks at the price and payment terms.

How do you emphasize the importance of your payment terms when there is very little time to do so?

Insights from RIABU's Mark Laudi and Simon Littlewood.