As an example - an order form for a wardrobe. Your client can order a wardrobe: enter the dimensions, choose the material, number and color of the doors, choose other parameters and fill in their contact details.
In response, your potential client receives the cost of making the wardrobe, calculated by the entered formulas and an order form with a link to payment (optional).
Widget
(the form can be embedded in any existing website)
Mobile version
Please notice:
Ordering a wardrobe is just an example of a business. It can be an order form for mirrors, plastic windows, apartment renovation, or any other service, for example, insurance policies.
More about order forms and / or payment for services and other examples are here. You can order a free demo here.