There are as many ways (perhaps even more) to ask for sale with written word as there are in person. But, you Must ask for it! Here are some examples:

The Assumed Close

With direct in-person selling, this is one of big ones. Forget old adage about never assuming anything, when it comes to selling; just assume that your prospect is going to buy. For example:

"Well Bob, all we have to do now is process order and get you started today!"

You can say that in person, and you can also use it in writing. With personalization feature in your follow-up responder, you should address person by name, and ask for their business. Tell folks Exactly what you want them to do next:

"Click Here and fill out order form. Once you have done that, you will be redirected to a page where you can get (download, set up, call, or whatever case may be) your hands on product and get started Now!"

The Internet really speeds up process with Real Time ordering, and instant downloads. Many times a live sales person has to wait for home office to ship your order, but when dealing with digital products, transaction can take place instantly! Use that to your advantage in closing sale.

"Let's get you set up right now Bob!"

The Option Close

When I built my first website, I was mistaken thinking that just because I put a form to capture email addresses, people would fill it in. Very few did.