One small step...

.gitignore

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+/vendor/
+composer.lock
+.DS_Store

Makefile

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+# override like so: make dependencies COMPOSER=$(which composer.phar)
+COMPOSER = ./build/composer.phar
+
+.PHONY : test
+test:
+	php ./test/Affirm.php
+
+.PHONY : dependencies
+dependencies:
+	$(COMPOSER) update --dev

README.md

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+[![](docs/splash.png)](https://affirm.com) 
+
+**Compatible with**
+
+Magento CE 1.4.0.1+
+
+Install
+-------
+
+**To install using [modgit](https://github.com/jreinke/modgit):**
+
+```
+cd MAGENTO_ROOT
+modgit -i extension/:. add Magento_Affirm [email protected]:Affirm/Magento_Affirm.git
+```
+to update:
+```
+modgit update Magento_Affirm
+```
+
+**To install using [modman](https://github.com/colinmollenhour/modman):**
+
+```
+cd MAGENTO_ROOT
+modman clone [email protected]:Affirm/Magento_Affirm.git
+```
+to update:
+```
+modman update Magento_Affirm
+```
+
+**To install using Affirm's deploy script:**
+
+1. Download the [Makefile](https://gist.githubusercontent.com/perfmode/ad8cf189bbbaeeae1181/raw/6fb5e861a6dddc8cd6685573e492b0662c498a15/Makefile) (requires wget)
+2. Copy to MAGENTO_ROOT
+3. To install, run `make install`
+4. To update, run `make update`
+
+Configure
+---------
+
+1. Log in to your Magento Admin portal.
+2. Visit System > Configuration > Payment Methods (under Sales) > Affirm
+3. Set the API URL. In a test environment, use ```https://sandbox.affirm.com```. On your live site, use ```https://www.affirm.com```.
+4. Provide your 3 keys (merchant API key, secret key, financial product key)
+5. Adjust the order total minimum and maximum options to control when Affirm is
+   shown to your customers.
+
+![](docs/config.png)
+
+
+Contribute
+----------
+
+1. Fork the repo
+2. Create your feature branch (```git checkout -b my-new-feature```).
+3. Commit your changes (```git commit -am 'Added some feature'```)
+4. Push to the branch (```git push origin my-new-feature```)
+5. Create a Pull Request
+
+**To run the tests:**
+
+```
+make dependencies
+make test
+```

composer.json

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+{
+  "name": "affirm/affirm-php",
+  "description": "Affirm PHP bindings",
+  "keywords": [
+    "affirm",
+    "api",
+    "consumer finance",
+    "credit",
+    "e-commerce",
+    "payment method"
+  ],
+  "homepage": "https://affirm.com/",
+  "authors": [
+    {
+      "name": "The Affirm Technology Team",
+      "homepage": "https://www.affirm.com/company"
+    }
+  ],
+  "require": {
+    "php": ">=5.2"
+  },
+  "require-dev": {
+    "zendframework/zendframework1": "1.12.6",
+    "simpletest/simpletest": "1.1.*"
+  },
+  "autoload": {
+    "classmap": ["extension/lib/Affirm/"]
+  }
+}

extension/app/code/community/Affirm/Affirm/Block/Payment/Form.php

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+<?php
+class Affirm_Affirm_Block_Payment_Form extends Mage_Payment_Block_Form
+{
+    protected function _construct()
+    {
+        parent::_construct();
+        // TODO(brian): refactor this into a 3 step process to make the state
+        // change more explicit
+        $this->replaceLabel();
+    }
+
+    protected function _toHtml()
+    {
+        // TODO(brian): extract this html block to a template
+        // TODO(brian): extract css
+        $msg = "You'll complete your payment after you place your order.";
+
+        $html = "<ul class=\"form-list\" id=\"payment_form_affirm\" style=\"display:none;\">";
+        $html .= "<li class=\"form-alt\">";
+
+        // heading
+        $html .= "<div style=\"color:#034082; font-size:16px; \">";
+        $html .= "Pay over time in 3 easy payments";
+        $html .= "</div>";
+
+        // sub
+        $html .= "<div style=\"color:#6f6f6f; font-size:14px; \">";
+        $html .= "just enter your basic details and get";
+        $html .= "<br>";
+        $html .= "approved instantly.";
+        $html .= "</div>";
+
+        $html .= "</li>";
+        $html .= "</ul>";
+
+        return $html;
+    }
+
+    /* Replaces default label with custom image, conditionally displaying text
+     * based on the Affirm product.
+     *
+     * Context: Payment Information step of Checkout flow
+     */
+    private function replaceLabel()
+    {
+        $this->setMethodTitle(""); // removes default title
+
+        // TODO(brian): extract html to template
+        // TODO(brian): conditionally load based on env config option
+        // This is a stopgap until the promo API is ready to go
+        $logoSrc = "https://cdn1.affirm.com/images/badges/affirm-card_78x54.png";
+        $html = "<img src=\"" . $logoSrc . "\" width=\"39\" height=\"27\" class=\"v-middle\" />&nbsp;";
+
+        // TODO(brian): conditionally display based on payment type
+        // alt message: $html.= "Buy Now and Pay Later";
+        $html.= "3 Monthly Payments with Split Pay";
+
+        $this->setMethodLabelAfterHtml($html);
+    }
+}

extension/app/code/community/Affirm/Affirm/Block/Payment/Info.php

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+<?php
+class Affirm_Affirm_Block_Payment_Info extends Mage_Payment_Block_Info
+{
+
+    protected function _toHtml()
+    {
+        $html = '<a href="https://www.affirm.com/u/">Affirm Split Pay</a>';
+        return $html;
+    }
+
+}

extension/app/code/community/Affirm/Affirm/Block/Payment/Redirect.php

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+<?php
+class Affirm_Affirm_Block_Payment_Redirect extends Mage_Core_Block_Abstract
+{
+    protected function _toHtml()
+    {
+        $order = $this->getOrder();
+        $payment_method = $order->getPayment()->getMethodInstance();
+
+        $html = '<html><body>';
+        $html.= '<script type="text/javascript" src="'. trim($payment_method->getBaseApiUrl(), "/") . '/js/v2/affirm.js"></script>';
+        $html.= '<script type="text/javascript">';
+        $html.= 'affirm.checkout(' . json_encode($payment_method->getCheckoutObject($order)) . ');';
+        $html.= 'affirm.ui.error.on("close", function(){ window.location= "' . Mage::helper('checkout/url')->getCheckoutUrl() . '";});';
+        $html.= 'affirm.checkout.post();';
+        $html.= '</script>';
+        $html.= '</body></html>';
+        return $html;
+    }
+}

extension/app/code/community/Affirm/Affirm/Helper/Data.php

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+<?php
+
+class Affirm_Affirm_Helper_Data extends Mage_Core_Helper_Abstract
+{
+
+}