we basically need to implement fax services into our web based product(Made using c# and javascript) and we are having multiple customers.
If we want to write the app once and use it for multiple customers, does each customer have to register for a developer account and get a unique app key and app secret or can we use the same ones generated for our app under our developer account? there should be different fax number for each customer that is what we want.
so do i need create separate application for each customer to have separate fax number for them or anything else i need to do ?