Granting your client a consists in agreeing to defer a flow of cash into your treasury, even though the invoice has been signed and the turnover recorded. You must therefore ensure that your cash flow position allows you to do so.
This is why a good payment terms analysis of your working capital is essential before negotiating credit terms. The accumulation of trade receivables could reduce your free cash flow and handicap your current operations and investments.
It is also useful to check if your company has sufficient solid financial reserves in case of complications with a bad payer.