If you are a small organisation or just starting up and the client is big ticket size. I would suggest you should share some portion with the employee who recommended you.
It’s like an affiliate thinks in the offline world! For example, my friend has started a manufacturing unit and they want to sell to a big organization that has a high volume of demand coming up every month. So, they collaborated with the manager to send the PO every month and for that manager to get some amount on regular bases.
It’s not the common practice in IT/SaaS, but in manufacturing or with any big deals in corporates there are some people that you should keep happy to run your business/deal successfully.