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soap4r uses the http-access2 library to communicate with the PayPal servers, so download the latest stable release of this library from http://dev.ctor.org/http-access2/, extract the package, and install it with the following command: $ sudo ruby install.rb That s it. If you have the server running, restart it for the changes to take effect.
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To be able to test PayPal, you will first need to sign up for an account at PayPal Developer Central (https://developer.paypal.com/). After you log in, you are greeted with the page shown in Figure 9-5.
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Figure 9-5. The PayPal Developer Central homepage Along with links to the forums and help references, PayPal Developer Central provides access to three important areas: Sandbox: This is where you can create dummy bank accounts and credit cards that you can use for testing transactions without actually billing anyone. Test Certificates: This is where you can download the test certificate, which you ll need when communicating with PayPal over a secure SSL connection. Email: This page is where all e-mail messages that PayPal sends end up. Instead of sending them to your real account, PayPal simply stores them on its servers and displays them on this page.
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Using PayPal Developer Central, we will first create a business account and credit card in the Sandbox. This will include steps for verifying and confirming the account. Then we will set up the API credentials that Active Merchant needs when communicating with PayPal, by creating a private key and certificate. Finally, we can return to our application and implement the integration with the payment gateway.
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The Sandbox is a safe testing environment and replica of the production PayPal environment. We ll use it to create a business account and a dummy credit card for our tests. From the PayPal Developer Center homepage, click the Sandbox link to open the PayPal Sandbox page. Click the Create Account link and select Business Account. To create the business account, follow the suggested steps. Remember to write down the credit card information, because you ll need it later. Once you have created the test account, you should see it listed on the Sandbox page, as shown in Figure 9-6.
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Figure 9-6. The PayPal Sandbox page displaying the test account Continue by clicking the Launch Sandbox button beneath the Test Accounts listing. This opens the Sandbox login page. Log in, and you should see the business account, as shown in Figure 9-7.
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Figure 9-7. The business account displayed in the PayPal Sandbox Here, you can see that the status of the account is verified. In the example in Figure 9-7, we have already made some test transactions, which is why the account balance is $30,536,45.
Creating API Credentials
Next, we ll create the credentials that Active Merchant needs when communicating with PayPal. Follow these steps: 1. From the business account display (Figure 9-7), click the Profile tab. Then click Request API Credentials. 2. On the next page, select API SSL Client-Side Certificate, agree to the terms by selecting the appropriate option, and click the Submit button.
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3. On the following page, you should see the API username and API password, as shown in Figure 9-8. Click the Download Certificate button. This will download a file (cert_key_pem.txt) containing the private key and the certificate, in the following format: -----BEGIN RSA PRIVATE KEY----... -----END RSA PRIVATE KEY---------BEGIN CERTIFICATE----... -----END CERTIFICATE-----
Figure 9-8. The Download or Remove API Certificate page 4. Select and copy the private key, including the start and end tags, and save it in config/paypal/sandbox.key. 5. Select and copy the certificate and save it in config/paypal/sandbox.crt. 6. Download one of the PayPal Software Development Kits (SDKs), such as the PHP SDK, from http://developer.paypal.com. Then copy the server certificate (api_cert_chain.crt) to config/paypal/api_cert_chain.crt.
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