Inside your stripe account go to the top right to Create > Payment Link. This will take you to the Payment Page.
On the Payment Page, you can create a new product or select an existing product. This can be a 1-time payment or reoccurring payment for the product/service.
Once you select or create the product, you can make changes to the Options on the left under products. Once this is completed, select Next in the top right.
Then you will get the product link to copy and share with a client.