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In the last couple of videos we have been working nonstop on the header.

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And I think that we're now at a point where there's really nothing else that we can do with it right

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now.

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So we're going to pause working on the matter for just a little bit.

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Unfortunately we are going to come right back to it very shortly.

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But let's talk about another feature that we're going to start to work on.

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That's going to eventually lead us back to working on the header.

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I'm going to open up a diagram that we've looked at previously.

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Remember we looked at this to get a better sense of what we are working on and what we're going to be

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planning to work on in the future as well.

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Now I've added a couple of extra steps on this diagram and as a reminder everything green is related

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to the back end of our application.

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Everything in blue is related to the client side of the app.

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So we just finished up the client set up and the authentication system on client We're now going to

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move on to handling billing within our application.

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So building on our client and billing on the server.

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When I say billing I'm talking about accepting credit cards or accepting payments from our users and

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then somehow enabling additional features inside of our application based on the fact that they have

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paid us money.

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So as a reminder of why we are accepting money let's go back to our markets really quick.

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OK.

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So this mock up right here.

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So remember we've got the head at the top.

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I had said that we were going to have some button that says something like add credits on it a user

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if they click this will be presented with some message or some windows something some form where they

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can start to enter in their credit card details when they give us money if they give us like say five

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dollars.

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We will give them five credits in return every credit inside of our application allows our users to

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send out one individual mass e-mail survey.

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So if a user signed up for our application and they created these two surveys that we show up on the

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mark on our mark mark up right here excuse me that means that they must have used at least two credits

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one credit to send out this campaign another credit credit to send out this one.

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So clearly we want to be able to accept credit cards.

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We want to be able to accept payments.

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We want to accept money.

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And whenever a user sends us some money we want to somehow update their account and say OK here is the

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new number of credits you have.

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And then of course at some point in the future when we actually put together all this campaign stuff

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like actually sending out surveys we should make sure that a user has a sufficient number of credits

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and make sure that we subtract 1 credit for every survey that they send out.

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Now the world of billing is really its own topic and we can really without a doubt make a course about

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billing alone.

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And we could probably talk for days about how billing works and how it works in web applications.

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So we're going take a pause right now when we come back in the next section we're going to do a quick

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discussion about billing and side of web applications.

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We're going to talk about some general rules of thumb that we're definitely in a follow very closely

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within this course and Emily Mulally come back after that and start to integrate billing into our application

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specifically on the front end.

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So let's take a quick pause.

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Come back in the next section and start really diving into how we work with accepting credit cards from

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users.