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In this chapter, we ll demonstrate implementing credit card transactions with DataCash. DataCash is a credit card gateway organization based in the United Kingdom. You ll need a UK merchant bank account if you want to use it in the final application. However, you don t have to worry about this for now: it s very easy to get access to a rather useful test account you don t even need a merchant bank account. As you ll see later in this chapter, DataCash lets us perform test transactions using so-called magic credit card numbers, which will accept or decline transactions without performing any actual financial transactions. This is fantastic for development purposes, because we certainly don t want to use our own credit cards for testing!

Figure 9 23. Aiming the camera. Note that there is a yellow cross where the directional camera beam hits the monkey array, marking the depth-of-field distance of the camera. 8. Finally, add a Depth of Focus node to the nodal setup (press Shift+A, and then select Filter Defocus, as shown in Figure 9 24).

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So the width and height parameters passed to the delegate manager s sublayout method will be less than or equal to the width and height parameters passed to the screen s sublayout method 3 The delegate manager iterates through all the fields and managers it contains and lays out each of them, that is, positions them within itself, tells them how much space is potentially available and asks them what size they ll be on screen This has the effect of calling sublayout (for a manager) or layout (for a field) The width and height available to each of the fields and managers will vary depending on how the delegate manager lays out its fields.

Whichever gateway you use, the basic principles of credit card transactions are the same First, the sort of transactions we ll be dealing with in an e-commerce web site are known as Card Not Present (CNP) transactions, which means we don t have the credit card in front of us and we can t verify the customer signature This isn t a problem; after all, you ve probably been performing CNP transactions for some time now online, over the phone, by mail, and so on It s just something to be aware of should you see the CNP acronym Several advanced services are offered by various gateways, including cardholder address verification, security code checking, fraud screening, and so on Each of these adds an additional layer of complexity to your credit card processing, and we re not covering those details here.

Finally, you can adjust the sliders in the Color Key node to get as good a balance of greenscreen color tolerance as you can. My results are shown in Figure 9 29.

Rather, this chapter provides a starting point from which you can add these services if required Whether or not you choose these optional extra services depends on how much money is passing through your system and the trade-off between the costs of implementing the services and the potential costs, which could be prevented by these extra services if something goes wrong If you are interested in these services, that customer service representative mentioned previously will be happy to explain things As it stands now, we can perform several types of transactions: Authorization: Check a card for adequate funds and perform a deduction Preauthorization: Check a card for funds and allocate them if available; this doesn t deduct funds immediately Fulfillment: Complete a preauthorized transaction, deducting the funds already allocated Refund: Refund a completed transaction or simply put money on a credit card.

In many cases, they may be greater than the height and width of the delegate manager itself; this means that the delegate manager is a scrolling manager and will only draw a subset of its fields at any time..

Again, the specifics vary, but these are the basic types In this chapter, we ll use the preauthorization/fulfillment model, which means we don t take payment until just before we instruct our supplier to ship goods This structure was hinted at by the structure of the pipeline we created in the previous chapter..

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